i think it's a great idea but you have to be able to tether to rocks and your craft needs to be extremely strong to not be either busted open, unhitched, or literally smashed against submerged rocks by the flux of pole shift grade ocean water movements
i'll stick to going to the highest plateaus and burrowing into rock and sealing that up... the ocean may wash over me but it's gonna be the shortest time it is covering the land due to me picking high altitude and far inland, and i will put compressed air cylinders in as part of my prepping in this refuge space... and actually, i just want to build underground anyway
but if you can think of a way to build something that can take the worst storm of history, multiplied by 1000, then be my guest
if you read the account of Noah in The Book of Jasher you may rethink it
that dude barely survived, whoever told him how to build it was a genius, i mean, so, it is possible to survive, but i'd argue that you also have to do this in a location where you know the flow is not going to smash your little vessel against the rocks before the big movements are over, whoever told Noah what to do had very advanced Science