The Manitoba No Reply (The Secret Ray)

The transatlantic liner Manitoba breaks down on its way to England and then the passengers and crew fall strangely asleep. When they wake up it is to find that they have all been robbed of their valuables. Later, while on holiday at the seaside, Jo, Zette and Jocko, playing in a rowing boat, get lost at sea when a thick fog comes down. Rescued by a submarine, they are taken to a secret undersea base where a mad scientist has plans for the two young children. ABC