How do you go mining with the Longship ?

I just built my first longship and it feels awesome sailing around the ocean! I need more iron, so I sail to a nearby costal swamp and jump out and go into a crypt and start getting that sweet iron. As you may have already guessed, when I go back out to load up the goods into the ship, it's been destroyed.

It's night, I'm cold, wet, not rested and running low on food. But there is still hope ! After a few near death experiences running around the shore, I successfully recovered everything from the ship wreck except the deer hide.

I now find myself in the half cleared crypt, wondering what my next move is, and how to avoid this situation next time.

My plan is to store all the scrap iron in a chest in the crypt and escape into the Black Forest to hunt some deer and then sail home. And when I return, I'll either destroy the shop myself, or have it loaded with building material to build a fortified dock.

How do you plan your mining expeditions ?