Cousteau

5 clues
Aqualung inventor
French conservationist
Undersea explorer Jacques
Marine conservation pioneer
Undersea World" explorer Jacques
Similar answers:
Acoustic
Acoustical
Acousticcoupler
Acousticguitar
Acoustician
Acoustics
Bateau
Bateaux
Batteau
Chasteauntschasedants
Chateau
Chateauboxers
Chateaubriand
Chateaugay
Chateaugustav
Chateaulafeet
Chateauofadoubt
Chateauoils
Chateaurooms
Chateaus