Early in 1943 Cousteau and Gagnan ordered Air Liquide to make at its factory in Boulogne-Billancourt two scuba set prototypes that Cousteau and Frédéric Dumas used to shoot the underwater film Épaves (Shipwrecks), directed by Cousteau the same year [REF].
In 1946 Air Liquide founded La Spirotechnique, its own division destined to conceive and mass-produce regulators and other diving equipment.