What happened to the missing Martin Mariner? Well, the crew of the SS Gaines Mill observed an explosion over the water shortly after the Mariner had taken off. They headed toward the site and there they saw what looked like oil and airplane debris floating on the surface. None of it was recovered because of the bad weather, but there seems little doubt this was the remains of the Mariner. The plane had a reputation as being a "flying bomb" which would burst into flame from even a single, small spark. Speculation is that one of 22 men on board, unaware that the unpressurized cabin contained gas fumes, lit a cigarette, causing the explosion..