Strange Apartment Building at the Sea

..exactly what it says on the tin haha

I was having a daydream where there are some inexplicable abandoned buildings built in the sea. There are some grocery stores, some one room apartments, a whole block of school and many others. Then some people swim there to have fun and others even occupied them as their play bases When the tide goes up though, they leave while some of them stay on the upper floor.... then I snapped out of it and forgot most of it
I ended drawing one remember haha