What were the primary operational environments for UDTs during WWII?

The primary operational environments for Underwater Demolition Teams (UDTs) during World War II were coastal and amphibious zones. UDTs were specially trained units formed to conduct reconnaissance, demolition, and disruption operations in these environments, which were critical for successful amphibious assaults. They played a significant role in clearing beaches of underwater obstacles, which would facilitate the landing of larger amphibious forces.

Coastal zones provided the necessary access to enemy beaches where UDTs could lower the risks for landing troops and equipment, while also minimizing the potential for enemy defenses to inflict casualties on the forces coming ashore. The training and operations of UDTs focused extensively on skills required to operate effectively in these environments, including diving, swimming, and explosives handling — all tailored for operations close to shore and connected to maritime operations.

Other environments listed do not accurately represent the mission profile or operational focus of UDTs during that era. Coastal and amphibious zones were vital theaters for warfare as millions of Allied troops counted on the success of UDT operations to ensure their landings were as safe and effective as possible.