Video: The Pakistan Navy’s fourth and final Hangor-class submarine under construction in China has been launched in Wuhan, Central China's Hubei Province, according to Pakistan Navy on December 17. | Global Times

A submarine pipeline, also referred to as a marine, subsea, or offshore pipeline, is a conduit laid either on the seabed or below it within a trench. While some pipelines are predominantly on land, they may traverse bodies of water, such as small seas, straits, and rivers. The primary purpose of submarine pipelines is the transportation of oil or gas, although they also play a crucial role in conveying water. A distinction is occasionally drawn between a flowline and a pipeline. A flowline funct

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