The Philippines is identified to hold the greatest amount of deuterium deposit, somewhere in the area known as Mindanao Trench, the part of the Pacific Ocean just off the shores of Surigao. Deuterium is most prevalent in an area more widely known in the whole world as The Philipppine Deep. In the Freeman news article (dated August 2004), Dr. Anthony B. Halog, the Filipino scientist working at the Sustainable Technology Office of the Institute for Chemical Process and Environmental Technology, and the National Research Council of Canada described the Philippine deuterium wealth in this manner:
“A big deposit of 868 miles long, 52 miles at widest point, and 3 miles at deepest point, replenished by nature 24 hours a day after deuterium travels more than 12,000 kilometers from Central America to the Philippines through the span of the Pacific Ocean when Planet Earth turns on its axis from West to East in unending perpetual motion.â€
Deposit of deuterium - nonsense! Deuterium itself will exist in the form of the gas D2, twice as dense as H2, but very much less dense than air, let alone sea water.
It may well be that the water in the Mindanao trench is slightly richer in deuterium than ordinary seawater, but this is not going to make the difference to anything. D2O, separated from ordinary water by a number of techniques, is not terribly expensive, but the practical problem of fusing deuterium in a reactor to make helium is nowhere near a solution, and may in fact never be solved.
You don't need to believe everything you read online, and if someone claims the support of the National Research Council of Canada or any other reputable body for a fantastic claim of this kind, you should try to track down the original reference and make sure if it is genuine.