This clip shows Edward Rowe Snow (1902-1982), the popular New England maritime historian and "Flying Santa" to lighthouse keepers, diving from Minot's Ledge Lighthouse, off Boston's South Shore, in 1962. I believe it was his 60th birthday. The door he's diving from is approximately 60 feet above the water.
For more on the Flying Santa, see www.flyingsanta.org. For more on Minot's Ledge Lighthouse, see lighthouse.cc/minots/