A human-occupied submarine descends to a record-breaking 21,325 feet.
According to a press statement from the Woods Hole Oceanographic Institution, on Thursday, the human-occupied submersible Alvin accomplished the deepest dive in the 58-year history of the legendary submersible when it successfully reached a phenomenal depth of 21,325 feet (6,453 meters) (WHOI). North of San Juan, Puerto Rico, near the Puerto Rico Trench, the incident happened.
need for U.S. Navy certification
It took 18 months to rebuild and improve the sub's maximum driving range from 14,800 feet (4,500 meters) to its current limit of 21,325 feet, and the dive was a crucial step in getting certified by the US Navy to restart operations (6,500 meters). This procedure was carried out since the certification dive must be between 6,200 and 6,500 meters according to Naval Sea Systems Comma...