submarine burning ice is usually called combustible ice.

combustible ice, also known as Gas drates or Methane hydrate, is a combination of natural gas and water similar to ice, which is naturally formed in nature and has a huge amount.

in a combustible ice molecule, water accounts for about 85%, and water molecules and methane form crystalline crystals, which are stable and methane molecules are surrounded by water molecules.

the cavity formed by water molecules is filled with methane molecules. In order to keep the methane combustible ice stable, at least 7% of these cavities are filled with methane molecules. In fact, this filling rate is usually as high as over 95%.

The main feature of combustible ice is that its burning energy is dozens of times more than that of coal, oil and natural gas, and it does not produce any residue after burning, thus avoiding the pollution problem that is the most troublesome for people. Scientists call combustible ice "the energy of the future" if they get the treasure.

Extended information:

The formation of combustible ice requires four basic conditions:

1. Low temperature, high pressure environment and sufficient gas source and water.

2. Combustible ice in nature mainly exists in the shallow seabed sediments and high-latitude frozen soil in high-pressure and low-temperature environment, about 97% of combustible ice is distributed in the ocean, and only 3% is distributed in the terrestrial frozen soil zone.

3. Combustible ice can be generated below 1℃, and will decompose when it exceeds 2℃.

4. At ℃, it can be generated at 3 atmospheres, and the greater the pressure, the more stable it is.

reference source: Baidu encyclopedia-natural gas hydrate.