Ruri and Nagi head out to hunt for opals but discover that the area has already been fully excavated.
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1. Ugh! I can't find these opals anywhere!
2. Whoever was here did a great job.
3. They dug out the entire stratum
containing opals.
4. I didn't expect to go home
without a single one.
5. There were whispers that this
area got depleted 20 years ago,
6. but I guess they were true.
7. 20 years ago?
8. Supposedly, the opals here
were once pretty famous.
9. Before I was even born?
10. Guess it can't be helped then...
11. Still, it's a hard pill to swallow.
12. I feel more worn out than usual.
13. I was banking on finding some
opals mixed into erratics, but...
14. Oh well. We were able to
locate and study its locality.
15. That alone is meaningful.
16. I guess you could say that.
17. Kinda feels like an excuse, though.
18. Cheer up, it happens.
19. Is that... a dam?
20. Yeah, what about it?
21. Do you like dams, Ruri?
22. Not one bit!
23. Time Capsule of 1.9 Million Tons
24. Time Capsule of 1.9 Million Tons
25. Water Testing Research Report
26. Good grief.
27. After all that talk about wanting
to do the report together.
28. Jackpot...
29. Whoa!
30. Are these all authentic opals?
31. Opals! Opals! Opals! Opals!
32. We hit the opal jackpot!
33. Huh? What's happening?
34. What's going on?
35. My sweet opals!
36. Alert announcement from
the Kusada Dam Management Office.
37. Due to abnormal flooding, we will
increase water release from the dam.
38. River levels will rise quickly.
39. Local residents are advised to stay alert.
40. Oh, it was just a dream.
41. What are you relieved for?
42. You've been out of it all day.
43. I know, my bad.
44. I'm a bit tired from yesterday.
45. I feel so sleepy.
46. Oh, did you go somewhere?
47. Yup, we were—
48. Attention all visitors.
49. Due to the approaching typhoon,
we will be closing early.
50. We'd better head home.
51. We sincerely apologize
for the inconvenience...
52. Huh? Oh, okay.
53. And that's how we left without any opals!
54. I'm jealous you got to hunt for them, though.
55. Wish I could've gone, too.
56. Ahh sorry!
57. It was kinda spur-of-the-moment!
58. No, it's okay!
59. I didn't mean it like that.
60. It's just...
61. I'd like to go mineral
hunting again one day.
62. Hey! We should go hunt for placer gold
when the weather gets better.
63. I bet we'll find tons thanks to all this rain!
64. Placer gold...?
65. Yeah!
66. So tell me, what does rain have to do with it?
67. If you wanna know...
68. Ask the sky and you'll get your answer!
69. Let's get going.
70. I-I'm telling the truth!
71. Look, a vending machine.
72. Whoa, did it fall into the river?
73. This spot's all dried up now,
but maybe it was underwater.
74. Yeah, it wouldn't surprise me
with that record-setting rainfall.
75. I heard the river almost overflowed.
76. Seeing stuff like this makes me
glad it didn't flood.
77. Yeah...
78. There we go!
79. Lemme find one real quick to teach you!
80. You seem pretty confident.
81. Found one!
82. Really?
83. See? That's placer gold.
84. U-Um, that looks like pyrite.
85. Oops, my bad!
86. So much for all that fuss.
87. H-Hey, don't give me the cold shoulder!
88. You find one?
89. Nope, just a small quartz crystal.
90. Cool how you can find so much
after a heavy rain.
91. I don't remember finding quartz here.
92. Ugh, what is all this pyrite doing here?
93. Is that a problem?
94. It's not that.
95. Just...
96. None of these minerals were here last time.
97. Maybe you should ask Imari-san.
98. Me? I'll do my best!
99. Yeah, let's stop by.
100. And ask Nagi-san.
101. I'd rather ask Imari-san...
102. That sucked!
103. We should've brought an umbrella.
104. Excuse us!
105. Arato-senpai, you should
care about fashion more!
106. Hey there. You two got rained on too, huh?
107. What are you guys doing?
108. Can you believe Senpai?
109. She got drenched in the rain,
and guess what?
110. She didn't have a change of clothes?
111. No, she changed. But...
112. Her clothes are exactly the same!
113. Senpai, you have too much
potential to waste like this.
114. But leave it to me!
115. I brought you cute clothes to try on!
116. Cute clothes? For me?
117. First off, cute and easy-going overalls!
118. Pretty comfortable.
119. Next, the sophisticated and composed sundress!
120. I didn't know skirts
were so easy to move in.
121. This is nice, too.
122. Nagi-san! You look great in all of them!
123. Can I pick something out, too?
124. And finally...
125. This special set...
126. The universally beloved maid outfit!
127. Seems best suited for housework
and waiting on people.
128. Look at me!
129. Too pure!
130. Our club made it
for last year's school festival.
131. We sold coffee in these outfits.
132. This isn't too bad, either.
133. So? Fashion isn't so bad, is it—
134. Yeah, I could get used to this.
135. Senpai, this is about fashion, remember?
136. Arato-san, is that...?
137. Hm?
138. Hey, it's an opal.
139. What? Opal?
140. Wow! So this is it!
141. It's beautiful.
142. If only I could have found some...
143. Oh yeah, did you two need something?
144. That's right!
145. Nagi-san, you see...
146. Interesting.
147. So these minerals showed up all of a sudden.
148. Yeah! Like quartz and pyrite!
149. Stuff we didn't find there before!
150. Hmm, maybe there's a new deposit somewhere.
151. Really? A new deposit?
152. Let's visit the site tomorrow and look into it.
153. There's something else I wanna check.
154. What's that?
155. That opal site we visited the other day
is in the mountains upstream.
156. We didn't have any luck last time, but...
157. So you're saying there's a chance?
158. I'm just saying maybe.
159. Wow, Nagi-san.
That was still on your mind, huh?
160. Why'd you say that? Doesn't it bother you?
161. Of course it does!
162. Then it's settled!
163. Let's go eat and fuel up for tomorrow.
164. What do you guys want?
165. Fried shrimp for me!
166. Do we have that at our cafeteria?
167. Nagi-san, you're wearing that?
168. I don't think anyone will mind.
169. Let's get going.
170. Okay!
171. Oh. Found ya.
172. Nagi's Respite
173. Opal is a well-known gemstone and an amorphous mineral. Its chemical formula is written as SiO2·nH2O (with "n" varying depending on the conditions).
What makes opal unique is that it contains some water (H2O), which is a rare feature in minerals. This water plays a role in creating opal's beautiful colors and shimmering effects, such as its red and green flashes.
However, the amount of water in opal can change depending
on its surroundings. If soaked in water, it can absorb moisture
and increase its water content. If left in a dry place, it can lose water
through evaporation. For this reason, a once beautifully
shimmering opal can lose its brilliance if moved to a drier environment where its water content changes.
If you ever feel that your opal looks a bit dull, it might be worth trying to soak it in water.
Interestingly, silica gel, commonly used as a drying agent, has the same basic chemical formula: SiO2·nH2O. Like opal, it is also amorphous and can absorb or release water. In fact, if we were to give silica gel a mineral name, "artificial opal" would be the only fitting description.
174. The blue or pink color
of some silica gels comes
from adding cobalt chloride
175. Drying
agents
are
opals?
176. Crunch
Crunch
177. Rice
crac
kers
178. Nagi's Respite
179. Dams are some of the largest structures ever built by man. Constructed far away from the city, these structures stand tall in remote natural landscapes, providing an awe-inspiring view in both scale and presence. With their sheer magnitude, it's no wonder some become tourist attractions in their own right.
But even these colossal structures eventually reach the end of their life cycle. When a dam is no longer in use, it's often simply left as is. Over time, it may be buried in sediment carried downstream, or openings might be drilled into it to prevent water storage, becoming nothing but a wall left to quietly fade away in the landscape.
Unlike their construction, dam closures rarely make headlines. And because many are located deep in the mountains in areas difficult to reach, there are few opportunities to see these retired dams in person. That said, there are dams like the Old Katsuragaya Reservoir Dam in Yamaguchi Prefecture, a dam built of red brick that's been preserved as a tangible cultural heritage site.
There's something compelling about a dam at rest, slowly returning to nature. It offers a different appeal that wasn't present during its years of active duty.
180. Old Katsuragaya Reservoir Dam
181. Don't fall
182. It's empty
183. Senpai, do you really think there's a new deposit?
184. It's possible after
that record-setting rainfall.
185. The rain could have caused
a landslide that exposed a new site.
186. It could be in the mountains,
so remember to look on this side, too.
187. Okay, I'll be sure to check!
188. There should be a hint, like fallen trees.
189. Nagi-san, look at this rock!
190. This is it. It's an opal.
191. I thought so! I found it on the ground.
192. Looks like we're on the right track.
193. Fallen trees!
194. There's a ton of them.
195. They still have leaves.
196. It can't have been long since they fell.
197. And their roots are intact.
198. The soil must have collapsed beneath them.
199. If that's the case, then...
200. A landslide!
201. Just as we thought.
202. Grains of pyrite.
203. This must be the new deposit.
204. You were right!
205. So? Where's the opals?
206. We'll have to look.
207. Yeah! Betcha I'll find one first!
208. I doubt we'll find opals from these ores.
209. What?
210. Take a look at this rock.
211. There's a hole in it?
212. These holes serve as indicators
of whether opal is present.
213. Opal forms when groundwater
flows into cavities like this,
214. and silica that dissolved
in the water gradually precipitates.
215. Opal
216. This hollow means that these ores
haven't been affected by groundwater.
217. That's how I know there's no opal here.
218. The source must be further upstream.
219. Makes sense.
220. Hey, have we hunted for
this whitish mineral before?
221. It looks familiar.
222. You mean the chalcedony from the beach?
223. Their composition and formation process
are pretty much the same.
224. They are?
225. Opal
226. Chalcedony
227. Between opal and chalcedony, the only
difference is the temperature of groundwater.
228. With colder groundwater,
the silicon dioxide doesn't crystallize.
229. Instead, it precipitates
as spherical aggregates.
230. Opal
231. These non-crystalline masses
are what we call opal.
232. Slightly warmer groundwater
leads to fine fibrous crystals.
233. Chalcedony
234. These are chalcedony.
235. So, it's more sparkly with colder water?
236. Actually, that's caused by the
different sizes of the spheres.
237. Remember how structural color impacts light?
238. It sparkles when they're the same size!
239. You taught us that about sea glass.
240. Did you find something?
241. It's a dam!
242. It looks massive from down here!
243. This must be what pyramids feel like.
244. Massive man-made architectures are so exciting.
245. We made it this far, huh?
246. Can we climb up top?
247. I see stairs over there.
248. Wanna go?
249. Yeah!
250. Yes!
251. Wait up!
252. Hurry!
253. This is awesome!
254. Look! There's stuff floating out there.
255. They look like driftwood.
256. All of them? That's crazy!
257. Yeah.
258. The river nearly overflowed downstream,
but imagine all this water on top of that.
259. Things would've been way worse
than just that vending machine.
260. One of the purposes of dams
is to prevent flood damage.
261. Japan has always struggled
with flooding given its geography,
262. so managing water volume is
an important prevention method.
263. But for better or worse,
264. Oppose the dam construction
265. dams have a significant impact
on the surrounding environment.
266. So even today, there's still a lot
of debate over their construction.
267. But there's no denying that flood damage
has decreased since dams were built.
268. I hardly ever thought
about them until now, but...
269. Yeah, I never knew how safe they've kept us.
270. Sorry, but do you mind if we go back down again?
271. Why? We already looked downstream.
272. The odds are low, but we may
have a shot at finding opals.
273. Wanna help me out?
274. We're looking at rocks in the river this time?
275. Yeah.
276. I guess we haven't done that yet, but...
277. Found one! It's an opal.
278. Here.
279. You're right.
280. So, there really is another deposit?
281. Not exactly.
282. The answer to this opal's sudden appearance
didn't lie in a new deposit.
283. It was at the bottom of the dam.
284. Oh yeah! I hadn't thought of that!
285. But Senpai, rocks released by a dam?
286. Is that weird?
287. Yup.
288. Dams don't only block water.
289. It blocks rocks and sediment
that flow down from upstream.
290. So typically, discharged water
doesn't contain any rocks.
291. There's nothing here!
292. Inflow
293. But when there's an abnormal amount of
inflow due to heavy rain like the other day,
294. Outflow
295. dams sometimes release as much water
as they take in to prevent collapse.
296. This is called an emergency discharge.
297. Inflow
298. Outflow
299. In these cases, there's
much more water released.
300. So theoretically, an opal could
easily get swept away with it.
301. But like I said, it's just a theory.
302. Who knows if there's any more that—
303. Time to start hunting!
304. Hey!
305. I wasn't done...
306. First one to find an opal wins!
307. We can't stay for long!
308. Where are you, my opal?
309. Find any?
310. Nope, nothing.
311. Ruri, how about you?
312. None yet!
313. Imari-san, could this be an opal?
314. Doesn't look like it.
315. We were lucky to find that first one, but...
316. Maybe I was too optimistic.
317. This is going nowhere.
318. I can't find squat!
319. If only we knew more about
what it was like during the rain.
320. The river would have been much bigger
when the opals were released, so...
321. Wait a second...
322. So pretty.
323. They really are.
324. It makes sense now.
325. These opals made it out of the dam
because of their weight.
326. All the proof since not
a single one is in matrix.
327. They were likely buried
under heavier debris before.
328. What do you mean?
329. Empty Space
330. Specific Gravity
331. Opal
332. Quartz
333. Typical
ores
334. Roughly
335. Pyrite
336. Opals are extremely light for a mineral.
337. It's due to its porous structure.
338. When the dam discharged water,
it stirred up accumulated sediment.
339. Opals sink slower, so
it's no wonder they flowed out.
340. It's not something that happens often,
341. but the heavy rain and light opals
made it possible.
342. I never thought we'd find this many, though.
343. It's so cool.
344. They were supposedly lost 20 years ago,
but there were so many of them.
345. You're right.
346. It may just be a by-product,
but this spot was created by the dam.
347. So that's part of the dam's job, too?
348. I wouldn't say that.
349. Its main job is to protect our everyday lives.
350. In fact, we should be thankful
for even being able to hunt for minerals
351. after all that rain.
352. You're right.
353. This one's pretty, too!
354. I'm trying not to go overboard,
but I can't help myself!
355. All of these opals are up for grabs.
356. It's like a dream!
357. A-Are we really allowed to
take this many home?