Robert Tills 's body was never found and he joined a list with 78,000 other Americans missing in action during World War II .
The rest of the crew escaped unharmed and the Catalina sank to the bottom of the bay with Tills 's remains still on board .
Tills   's body was never found and Tills joined a list with 78,000 other Americans missing in action during World War II .
The rest of the crew escaped unharmed and the Catalina sank to the bottom of the bay with Tills 's remains still on board .