Lost at Sea
Lost at Sea is an area found in Black Space. It can be accessed through a boat in Water Walkway.
Overview
Lost at sea is collection of rooms that is sea themed. It can be accesses through interacting with the boat in the lower right corner of Water Walkway.
First Omori has to swim through a small section with ladders. Then he'll get warped to the big black sea.
Maps
Black Sea
A long stretch of sea that goes north. It's raining and a lighthouse's foghorn is blaring in the background. Swimming far enough will bring Omori to the next area.
Room with well
Almost the same as the room prior, expect that there's now land at the top with a well that can be entered.
Endless Well
In that well is a long ladder that leads downwards.
Two Beds
At the bottom of the ladder is a room with two beds. Interacting with the left one will cause Omori to push it away, revealing another ladder.
I'm Sorry
Interacting with the ladder will bring you to a black void with blurred Blackletters in the middle. If Omori goes near them, the blackletters will become readable, spelling out "Im sorry".
Walking out of this room will put you back into the room with the two beds.