Aside from the suggestive top panel, I'm presuming that the IJN had to train to dive from fairly high platforms into the sea. They must have believed that having the capacity to jump from a large, elevated platform at sea without being scared of the water, and then treading water for long periods of time might be helpful for people on large ships with elevated decks that were constant targets of sinking for some reason.
Aside from the suggestive top panel, I'm presuming that the IJN had to train to dive from fairly high platforms into the sea. They must have believed that having the capacity to jump from a large, elevated platform at sea without being scared of the water, and then treading water for long periods of time might be helpful for people on large ships with elevated decks that were constant targets of sinking for some reason.
and this hell of painfull training help save hundred to thousand sailor in WW 2.
Even as a ship girl, your body is like a humanYou're a ship girl now! It's unsightly to see you unable to do the naval school standard 10 metres dive jump!I’m sure you understand what I wantNo! Don’t come any closer!Now shut up and JUMP!Seems like the training goes from 5 -> 7 -> 10m heightAdmiral! Show me example!Noooooo