Sea
The crab will have a hard time pulling down, because as soon as the harpoons are confirmed hits, several men begin pulling on the chains attached to the harpoons, trying to hoist the crab out of the water. They pull in a rhythmic HEAVE, hand over hand.
The captain begins his order for the next phase of his plan. "Get that chain around the mast and attached to the anchor! Keep pulling yah bilge rats! No slacking!" A few crewmen follow his orders, but if the crab is too strong for the pulling crew they can't be succesful.