Which group is responsible for undersea operations in the NSW?

The correct answer identifies Group 3 as the group responsible for undersea operations within Naval Special Warfare (NSW). Group 3 is specifically tasked with conducting special operations that occur in maritime environments, which includes undersea warfare, unconventional warfare, and direct action missions. Their training and operational focus include expertise in diving, combat swimmer operations, and other special tactics that utilize underwater environments effectively.

This group's emphasis on undersea operations is critical as it supports various mission sets that ensure strategic advantages in maritime operations. The capability to conduct operations in such an environment is vital for the success of many special operations missions, highlighting Group 3's role in overall NSW efforts to maintain dominance in aquatic operations.