Originally posted by ShaftAlmighty:

As mentioned before, the swamp is the big boy test, the REAL difficulty hike.

Whenever you encounter a crypt, go to your map, zoom in, and mark it. You don't want to explore crypts all lazily like a silly goose. Prepare for an extensive exploration of each crypt individually.

I apologize for saying silly goose, though very harsh, the words seemed necessary.

Adding onto this. Antler picks work(easy to get a few of them), and you can build a craft bench and chest right outside the crypt you're working on for easy repairs and iron storage.
That way you can knock out an entire crypt in one shot and don't have to run home and dump inventory and repair every time.