Fightin' Five #39

The Fightin' Five confront Zero, an evil genius who has set up five death traps and threatens to launch missiles at their homeland if they move. After organizing a military search of a nearby swamp and river, the team discovers Zero's submarine base hidden in an island clearing. When Zero spots their approaching cruiser, he detonates his vessel, apparently killing all members of the Fightin' Five, though Zero's agent reports that missiles are ready for the final phase of the operation.