If you walk around the area by the water that surrounds the Mirelurk lair, you can find a different door that leads into the dungeon. I think it's an Easy lockpick. Once you go into that door, you can find the egg pod spawning thingy's on the ground in that immediate area. Waaay easier. Although there are still two Mirelurks around so be careful.
Walk not down that road, I cannot tell you where it goes, ask me no more questions, some things you weren't meant to know.