Tom Swift and his Dyna-4 Capsule

Young scientist-inventor Tom Swift dives into the Mariana Trench in his advanced Dyna-4 Capsule, searching for rare metals. His mission takes an unexpected turn when he encounters mysterious green glowing bubble creatures and is attacked by fish men. On orders from Washington, Tom must recover a stolen vial of a highly destructive explosive, leading to a dangerous whale chase and a confrontation with ruthless enemies.