I had always wanted to try a Sea Ice play through, but couldn't see how to survive the early game. So full disclosure: I started as an Archonexus part 2 site. This way I at least started with warm clothes, good guns, genetics, etc. I had assumed the hard part would be surviving hypothermia and starvation, but what I learned is the challenge is surviving the nothingness. Nothing to eat, nothing to build with, nothing to trade. So the only way to survive the early game was to eat raiders, ideally after harvesting their organs. The first 2-3 years were really brutal and started getting better only after deep mining and hydroponics. To answer your question, there must have been 100's of raiders contributing their protein to my survival.
Props to those players whose origin site is sea ice.