Hi, to escape; make sure you're very close to any water surface then aim at the water, once you aim an option should appear on the screen, if it's still not appearing;
try reloading the save.
Check out the following link: (GIF image)
https://imgur.com/a/hVLMA
You can read more at (blog): https://www.ashore-game.com/single-post/2017/05/29/Update-50-Survival-Ending-Part-33
Or by pressing 'F2' in the game to access the game guide > escape (it explains step by step how to escape).
Goodluck!