It is, as we've already made clear, a day to be by the water — or, even better, in it. But might we suggest you not attempt to go in the water by building a homemade submarine and launching you Cousteauian adventure in the East River near the Queen Mary 2, which is docked off Red Hook? "Several men are being questioned by police after being stopped apparently attempting to set sail off Brooklyn in a makeshift submarine-type vessel," reports WABC-TV. WCBS-TV says three people were escorted from the area by police, the captain was issued a Coast Guard violation, and — here's the best part — "the vessel bears a striking resemblance to the 'Bushnell Turtle,' the first American submarine, invented around 1775 in Connecticut by David Bushnell." So remember, kids: No revolutionary-era subs near the big cruise ships. Okay?

Makeshift Submarine Found in East River [WABC]
Odd Replica Sub Intercepted Near Queen Mary II [WCBS]
Adventures With an Egg [Flickr via Gothamist]