Japanese → English transcript

If you are climbing a glacier, you must absolutely avoid puddles. When climbers find a puddle, they insert their ice axe like this to check the depth, because on a glacier

what looks like a harmless puddle of meltwater can actually be the entrance to a dangerous crevasse. A crevasse is a crack that can be several dozen meters deep, and once you fall in,

it is a pit where getting out on your own or being rescued from outside becomes extremely difficult. By watching out for these puddles, climbers can reduce the risk of falling into hidden crevasses and stay safe—

that is the story, but quite often they are covered with snow, making them like the nastiest natural traps imaginable. They are extremely troublesome, so do not even go onto a glacier in the first place.

That said, crevasses tend to form in the same places, so the best solution is to research your route in advance and detour around them. Also, crevasses are capricious

and conditions often make them very likely to form, so even if you find one before falling in, I recommend you do not let your guard down and carefully move away from that spot—but I am telling you, do not go onto a glacier in the first place.