My first thought was the location and recovery of World War I ace, Captain Edward "Eddie" V. Rickenbacker’s B-17 that had water landed with eight survivors:
It is not located in US waters and not a grave site.
The story goes something like this:
Captain William Cherry, Jr.’s B-17 was supposed to fly Captain "Eddie" Rickenbacker from Hawaii to Port Moresby (with a fuel stop at Canton airfield on Kanton Island, in the Phoenix Islands).
Rickenbacker’s mission was to briefly tour of the Pacific theater to review conditions, operations, and to personally deliver a secret message from President Roosevelt to rebuke General MacArthur.
The bomber "went off course due to a navigation error due to an out-of-true octant", ran out of fuel, and was ditched at sea, October 21, 1942. Crew and passengers survived the water landing.
It is thought that Captain Cherry overshot Kanton Island by at least 100 miles to the southwest.
After 8 days adrift, the eight survivors dined on a seagull that landed on Rickenbacker's head.
Rickenbacker and two others were rescued by the pilot of a Navy Kingfisher, off the coast of Nukufetau in Tuvalu, 500 miles away from Kanton, after being adrift for 21-24 days. Seven of the eight were eventually rescued. One died on the ninth day at sea.
http://www.historynet.com/eddie-rickenbacker-and-six-other-people-survive-a-b-17-crash-and-three-weeks-lost-in-the-pacific-ocean.htmhttp://www.janeresture.com/rickenbacker/There are 3 period stories about the water landing:
Rickenbacker's book: "Seven Came Through"
James C. Whittaker 's (water landing survivor) book: "We Thought We Heard The Angels Sing"
Life Magazine: "Eddie Rickenbacker Tells his Own Story", three part series, 1943