Diving suit

A diving suit was a type of protective clothing which allowed the wearer to spend long periods of time underwater. Typhoon was a manufacturer of diving suits.

19th century
The Twelfth Doctor and Bill Potts wore diving suits in 1814 to travel beneath the surface of the River Thames. There, they discovered a chained creature. (TV: Thin Ice)

20th century
In an account dated to January 1965, diving suits were in use by both gang members and MI5. Carl, the leader of a gang, used a Typhoon-branded diving suit to sneak aboard MI5 agent Captain Blacker's yacht just off the coast of Monte Carlo, before proceeding to shoot him with his Henrietta .45 Supermatic and steal the plans to a nuclear device, plans which would originally have been passed onto Jimmy Bondson during a rendezvous aboard the yacht. Carl used his suit again when exiting the yacht, setting an explosive on the side of the ship, and detonating it.

This explosion was seen by fellow MI5 agents Jimmy Bondson and Telman, who were just arriving in Telman's ship. After speculating about how the explosion occurred, Telman helped Bondson to don a diving suit (also branded Typhoon) so that he could search the wreck for the plans. Upon entering, Bondson found Blacker's corpse and the plans missing, causing him to call International Rescue for help. Carl would continue to use his diving suit when diving from his boat in a boathouse to get to his gang's submarine, and when kidnapping "Gayle Williams", a fashion model who had written an article for a newspaper describing such things as the kind of gun used for the murder. Upon returning to his gang's submarine, he was still wearing the suit; ultimately, when he and his gang were put out with sleeping gas, he was still wearing the suit. (TV: The Man from MI.5)

Other sources dated the activities of International Rescue to the 1990s, (PROSE: The Dying Days) the 2060s, (PROSE: Titan Declares War! et al.) and the 2080s. (PROSE: Captain Scarlet in Death Crash! et al.)