The 1998 Mallik 2L-38 Hydrate Research Well Program in Canada’s Mackenzie Delta, permafrost area, led by the GSC and the Japan JNOC, was successful, but the goal of producing from NGH was not accomplished for the warming weather and mechanic failure. GSC and JNOC, as well as other 8 partners returned to Mallik in 2002. Three wells-the 3L-38 and 4L-38 observation wells, and the 5L-38 production well were drilled. Gas hydrate core was gained from the 5L-38 well at 90% core recovery and geophysical studies were conducted. Two short-duration production tests were conducted—a depressurization test with MDT tool and a thermal injection test. One encouraging result was the 470m3 of gas production by a thermal injection technique employing hot fluid circulation. Then, for the 2007—2008 Mallik production test program, the 2L-38 well, drilled in 1998, was modified to establish a production test well by reaming, deepening, casing, and cementing. An ESP was set below the perforation zone to depressurize the formation by dropping the water level in 2007. During 125h of the test, at least 830 m3 of gas flow was obtained. The test results verified the effectiveness of the depressurization method even for such a short duration. The 2008 testing program at Mallik confirmed that continuous gas flow ranging from 2000 to 4000 m3/day was maintained throughout the course of the 68 day (139 hour) test. Cumulative gas production volume was approximately 13000m3, which data confirms that the depressurization method is the correct approach for gas hydrate production. The 2008 Mallik gas hydrate production program was a landmark in hydrates R&D in the world.