What organization handles port opening operations and geotechnical services?

The organization responsible for port opening operations and geotechnical services is the Underwater Construction Team (UCT). UCTs are specialized units within the Naval Construction Force that perform a variety of underwater and port operations, including the assessment and establishment of ports and harbors following a crisis or disaster. Their expertise includes conducting underwater construction and repair operations, which are crucial for ensuring that ports can be opened and utilized effectively in support of military and humanitarian missions.

Other options, while related to construction and engineering in various capacities, do not specifically handle port opening and geotechnical services to the same extent as UCTs. Seabees are broadly involved in construction and support roles but do not focus specifically on the direct operations of port opening. The PHIBLET Combat Construction Battalion (PHIBCB) typically deals with amphibious operations and associated constructions but also lacks the specialized focus on port operations that UCTs have. NAVFAC primarily manages and oversees facilities and construction support for naval activities but is not primarily tasked with hands-on port opening operations. Thus, UCT is the correct choice for the specific functions mentioned in the question.