Challengers of the Unknown #60

Challengers of the Unknown #60 (On Sale: December 7, 1967) has a completely unconvincing cover by Bob Brown, which also suffers from some really poor coloring.

"The Thing That Could Not Die" is by the standard team of Arnold Drake and Bob Brown and is followed by "2 Hours to Die," a reprint from Challengers of the Unknown #41 by France Herron and Bob Brown. Prof pilots a mini-sub to the ocean floor to conduct some demolition work. His sub becomes trapped by some large boulders. His explosives are set to go off within two hours. The other Challengers each attempt to rescue Prof before the bomb explodes. Ace and Red both fail and are injured in the attempt.

Edited by Murray Boltinoff.