Issued by the Pobjoy Mint, this copper-nickel coin marks the 25th anniversary of the death of a modern-day aquatic pioneer, Jacques-Yves Cousteau. The obverse features a balloon on the deck of the Calypso, ready for aerial reconnaissance of the frigid Antarctic waters. Cousteau's eye-opening work introduced many to the critical concept of conservation and inspired generations to protect our planet. Queen Elizabeth II obverse. Limited mintage of just 1,950 pieces.