If you jump into the sea, it is very difficult to get out. This is one Bug, you glitch through the stairs there and you have to try it several times to get out. First i didn't get out, so i tried to drown. At some edges you can stand, i pressed V to lie on the ground. As drowning is very buggy, i swam into the sea and from this moment on my character bugged under the sea. This only happens at the edges where an additional wall is placed. {F32473}