HCA: Hermit Crab Association

I am new to owning crabs and most of them have gone down in the substrate! They dug big holes and went under but a few are still up! The ones that are still up seem to have covered the holes up with sand as they have been moving around!! Will the crabs be able to resurface when they need to if their holes are covered over??

They backfill their own tunnels. Its completely normal, no worries.

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Ah thank you! I was worried they wouldn't be able to get up through all that sand if they were covered over!!!

Just to add to what @Rawrgeous said, most of the time a crab doesn't even reuse the same same tunnel to emerge -- it just digs another one and comes up in a new spot. Digging is one of the things crabs do just for fun. You'll get accustomed to finding enormous holes in the substrate, holes that have swallowed food bowls and bits of tank decor overnight !