The Solus Project

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I'm going to write this in English because the translate isn't so great.

H2S is Hydrogen Sulfide. Wilson will tell you "Warning: Biohazard detected"

So for those of you who finished flashpoint caves, bring a torch. If you are at the end of the game, this is easy to access as well.

Start on the island with the tower that you have to construct. You want to follow the cable back down to the little room with the long ladder that goes down to the caves. From there you will hit a fork with two doors. You're going to go left. Eventually you will be in the library. From there you will open the door at the end of the library on the left, if you haven't already. Keep walking the path until you are in front of rocks covered/surrounded by the white hydrogen sulfide with green spots. There will be white strings hanging down from the ceiling. Wilson will say "Warning: Biohazard detected". *Sleep and save before you do this* walk/run to the middle of the path with your torch unequipped, quickly equip and drop your torch. Then run back to the beginning of the path. If done right and fast enough, you should have survived the explosion while taking some damage. Achievement will pop.

Good luck hope this helps.

For reference:
The beginning of the video is where you will be after going down the ladder. 5 minutes later is where you want to be. Takes less time if you already beat the game.

Credit to WeaselZone for his helpful let's play episodes.