I lost my first Seamoth in a similar way. Wasn’t near the Mountain Island though. I thought it would be neat if I circumnavigated the Aurora wreck in my Seamoth. I went to the far end (front), knew nothing about the near end (back, with the thrusters), and didn’t bring enough food or water to spend a night hiding. I barely got out alive, and it was only because the Seamoth died to the last Reaper.
