I was listening to "Nautica" by krill.minima, and it got me in the mood for some "sea" music.
A few things came to mind immediately, such as Eluder, Loscil & a new track by Intrusion. From there I just searched for tunes with 'sea', 'water', 'ocean' or other watery words in the titles. I think the tunes work pretty well together. The first 20 minutes has a great ebb & flow, breathing-like quality which I love.