Submerge is a game you can complete rather quickly (1.5 hours), will add my video walkthrough below though above it you can see a map of how to collect the 10 supply crates (red boxes)
which essentially are the story progression. Each crate is a progression in the story and once all ten are collected it ends.
Part 1 (Crates 1-3)
Part 2 (Crates 4-5)
Part 3 (Crates 6-10)
Good luck and of course Supply Crate collection order does not matter.