60 years later, pilots’ fate still a mystery is the headline for this wire service aricle I saw in the sunday Seattle Times-PI joint edition.

To summarize, during WWII, a Navy coast patrol blimp returned from a short mission sans crew; the gondola of this blimp later became the gondola for one of the flagship Goodyear blimps.

Goodyear provides some pix and info on the blimp too:

http://www.goodyearblimp.com/archive/h_ghost_blimp.html