Film Fun #2183

When Professor Goodwin’s deep-sea diving machine, the Mammoth, is stolen in the dead of night, Dan Carter and his ally Olive Goodwin must unravel the mystery behind the attack by a masked assailant—only to witness the colossal machine vanishing into the ocean. With the professor’s life’s work now at the mercy of the sea, the trio races to uncover the truth before the Mammoth becomes a threat beneath the waves.