I am posting this just for information purposes.
Interesting technology. This would allow them to create their own Jet Fuel while at sea:
http://oilprice.com/Energy/Energy-General/U.S.-Navy-Investigates-Making-Jet-Fuel-from-Seawater.html (http://oilprice.com/Energy/Energy-General/U.S.-Navy-Investigates-Making-Jet-Fuel-from-Seawater.html)
The process envisioned would catalytically convert carbon dioxide and hydrogen directly to liquid hydrocarbon fuel used as JP-5 by extracting CO2 to produce H2 gas from seawater and subsequently catalytically converting it into jet fuel by a gas-to-liquids process. The reduction and hydrogenation of CO2 to form hydrocarbons is accomplished using a catalyst that is similar to those used for Fischer-Tropsch reduction and hydrogenation of carbon monoxide. By modifying the surface composition of iron catalysts in fixed-bed reactors, NRL has successfully improved CO2 conversion efficiencies up to 60 percent.
Interesting link to a paper on the Fishcher-Tropsch reaction:
http://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/42_2_SAN%20FRANCISCO_04-97_0680.pdf (http://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/42_2_SAN%20FRANCISCO_04-97_0680.pdf)
Downside: reaction temperatures are 200-400°C. Not overunity, but allows an alternative route for fuel production