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valium vs xanax side effects On land, methane is released when previously frozen organic material decomposes. In the seabed, methane can be stored as a pre-formed gas or as methane hydrates. As long as the subsea permafrost remains frozen, it forms a cap, effectively trapping the methane beneath. However, as the permafrost thaws, it develops holes, which allow the methane to escape. These releases can be larger and more abrupt than those that result from decomposition.