As to the true purpose of the Underwater Recovery Unit ...

For those who want to know what the underwater recovery unit actually does,
here is a link, and here is a quick summary:



Active search and rescue (Recovery or rescue of individuals who have been involved in "water-related mishaps.")
Evidence location and recovery
"This evidence may include, but is not limited to, knives, guns, ammunition, jewelry, tools, body parts, bones, and clothing. Special methods are employed by the Team to preserve evidence that has been recovered from water."
Body loca...