Wow! What is that from? I am so jealous of the guy in the blue boilersuit, wonder if he goes any deeper, or is there any footage of him getting in to start with?
Even better, Gilligan pulled off his shirt afterward and stayed shirtless for the rest of the episode. Bob Denver told a story in his book GILLIGAN MAYNARD & ME about this scene. He said on a 2nd take he held his breath and stayed under awhile, hoping the crew would try to rescue him. The crew didn't fall for his trick though, telling him he'd already pulled the stunt in the lagoon too many times.