Six green scaled fishmen each manned two Vent Worms, holding their large black shells in place so that the worms within could direct their heat waves right into the metal vault doors below.
The Vent Worms were spaced just a short distance from each other so that their melting zones overlapped, creating one large spot of glowing white molten metal that would soon burn through the doors.
And then, it was open season to hunt the tasty and helpless humans down below.
Over a hundred fishmen gathered in a ring around the vault doors, licking their lips eagerly for their long awaited feast. A little ways from the main crowd their leader, the hulking, muscled, armor scaled shark variant, watched, overseeing this operation with gleaming yellow eyes.