Having spent 10 years of my life living on submarines (plus another 15 just riding them from time to time), I can tell you that you have certain advantages. One is that the air you breathe has not been recycled countless time. Second is that you can still get fresh food, not stuff that some alchemist labored over in an attempt to make it last decades in storage. And lastly you can still go outside and walk around in a large, spacious area. Just saying..