Which is a shame, because the U.S. has the largest federal water zone in the world, with more ocean area suitable for deep-water fish farming than the country has arable land area.

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But we are having to spend more oil to get oil, as we drill deeper, and drill in the deep water of the ocean.

FORBES: Why Oil Prices Rose in the Spring of 2008 and Will Rise Again

Indeed, Europa's ocean could be as much as 100km deep, which would mean that Europa has more water on it than Earth.

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"The high latitude North Atlantic Ocean is a globally important ocean region, as it is a sink for atmospheric carbon dioxide and an area where deep water formation takes place, " Prof Achterberg observed.

BBC: Iceland volcano ash cloud triggers plankton bloom