^After Cousteau himself, who had coined the word, the spelling was originally Aqua-Lung. See Jacques-Yves Cousteau & Frédéric Dumas, Le Monde du silence, Éditions de Paris, Paris, 1953, Dépôt légal 1er Trimestre 1954 - Édition N° 228 – Impression N° 741 (in French)