Explanation:

• China has successfully produced natural gas from methane hydrate, also known as “flammable ice”, in an experimental project in the South China Sea.
• Flammable ice consists of methane trapped within water crystals, and has been identified as a potential new gas source.
• Officially known as methane clathrates or hydrates, they are formed at very low temperatures and under high pressure. They can be found in sediments under the ocean floor as well as underneath permafrost on land. Despite the low temperature, these hydrates are flammable.