How Do Subsea Trees Work? A subsea Christmas tree is the pressure-containing valve assembly mounted on a subsea wellhead that controls, monitors, and safeguards flow from (or injection into) a subsea ...

Bald Cypress swamp at Atchafalaya basin in Louisiana. When is a tree not a tree? We often think of urban trees as simply poles in the ground, islands unto themselves, but they are ecosystems all their ...