'Jaws' behind the scenes pic

To celebrate the release of Jaws on Blu-ray, fellow Jaws junkie Eric (aka Quint) Vespe over at Ain't It Cool published this great shot as part of his Behind The Scenes Pic of the Day column. This is a photo I've seen before of Robert Shaw (the original Quint) lounging about between takes with Bruce the shark. Can you guess what scene they're shooting?

-Aaron Sagers