6 decades books

During the second World War, Japan began development of a super weapon in Occupied-Vietnam. Before WWII even began in earnest, they knew the project would never be complete in time. To make up for this fact, at the end of WWII, they froze all the weapons inside of cryogenic chambers, waiting for such time as they would be resurrected. But what happens when one of the mis-constructed weapons escapes?