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How could lowering pressure release methane from a methane hydrate deposit?

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natural gas The Troll A natural gas production platform in the North Sea, 80 km (50 miles) northwest of Bergen, Norway. Troll A, the largest movable structure ever built, rests on the seafloor some 300 metres (990 feet) below the surface and rises more than 100 metres (330 feet) above the sea. The platform regulates the recovery of gas from 40 wells located on the seafloor.

Methane hydrates are unique molecular structures where individual methane molecules are trapped within icy, cagelike lattices of water molecules. These deposits form only under very specific, high-pressure and low-temperature conditions, typically found beneath permafrost or within ocean floor sediments along continental shelves.1

Because the stability of the hydrate structure is dependent on these precise environmental conditions, reducing the pressure in the surrounding rock—such as by drilling into a hydrate-rich formation—can destabilize the lattice. This reduction in pressure allows the methane to break free from the water molecules, enabling the gas to be captured and extracted through a borehole.1

While this method is under exploration as a potential way to recover natural gas, any such extraction technology must be carefully designed to protect sensitive polar ecosystems and marine ecosystems where these reserves are located.1