When a shipgirl heads out to sea on a major operation,

the first thing that confuses them is the height of the waves.

That's because it looks different when you were a ship.

If you try to cross the waves like you did as a ship,

you'll be swallowed by the waves and sink into the sea.

You can't cross a big wave with the body of humanoid size.

In this case, you enter from the side

And go up.