What is an example of special reconnaissance conducted by UDTs?

The correct answer focuses on hydrographic recon conducted to destroy beach obstacles, which aligns perfectly with the unique skill set and operational objectives of Underwater Demolition Teams (UDTs). UDTs were primarily established for reconnaissance and demolition operations in support of amphibious assaults. Conducting hydrographic reconnaissance involves assessing the underwater landscape and identifying potential obstacles, such as mines or natural formations that could hinder troop movement during a landing.

This type of reconnaissance is critical because it provides vital information that helps in formulating effective landing strategies and ensuring the safety of incoming forces. By identifying and subsequently demolishing these obstacles, UDTs play a crucial role in facilitating the successful execution of amphibious operations.

The other options, while related to military operations, do not specifically categorize as special reconnaissance conducted by UDTs. For example, conducting air strikes or engaging in cyber warfare falls outside the direct scope of the UDT's missions, which are more closely tied to physical reconnaissance and demolition in aquatic environments. Gathering intel on troop movements is indeed vital intelligence work but is not a direct focus of UDT operations, which center more on environmental assessments rather than enemy troop tracking.