[narfquat]

Looks like the other bomb disintegrated on impact.

From Wikipedia:

The second bomb plunged into a muddy field at around 700 miles per hour (310 m/s) and disintegrated. The tail was discovered about 20 feet (6.1 m) below ground. Parts of the bomb were recovered, including its tritium bottle and the plutonium. However, excavation was abandoned as a result of uncontrollable ground-water flooding. Most of the thermonuclear stage, containing uranium, was left in situ. The Army Corps of Engineers purchased a 400 feet (120 m) circular easement over the buried component. The University of North Carolina at Chapel Hill determined the buried depth of the secondary component to be 180 feet (55 m), plus or minus 10 feet (3.0 m).