These places are workbenches and hideouts.
Use the bed in those places to heal Artyom and change the time of day.
At workbenches, you could:
There are three workbenches in the Caspian Sea.
You will find them by doing the main or side missions.
They are scattered around the entire map.
Go to any of them to repair your weapon or craft ammo.
Artyom can use hideouts to escape from enemies chasing him.
There is only one hideout in the Caspian Sea.
It is located in the eastern part of the map.
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