Hermit crabs generally don't inspire the excitement among divers that more sought-after marine life like flamboyant cuttlefish, pygmy seahorses, mimic octopuses and the like do, but actually...they are fascinating critters to observe.
Take this one for example.
I found this crab all alone, sifting through the rubble, presumably looking for food.
Often, these solitary crustaceans duck for cover or run away when you approach, but this one was so preoccupied with lunch that it paid me no attention...even as I positioned my camera, set up lights, got closer to get a better view, and so forth.
In fact, the crab was so nonchalant that it seemed as if the little guy preferred to have me around...so it wouldn't have to dine alone.