The Gut is a high-current channel situated between Bauza and Secretary Islands in Doubtful Sound. This site features vertical rock walls that descend from 10 to 60 metres, with an average depth of 30 metres. Due to the strong currents and challenging conditions, it is strictly for advanced divers. Access is by boat only. Divers can expect cold water temperatures ranging from 11 to 15 degrees Celsius and variable visibility between 4 and 15 metres. The habitat supports a variety of temperate marine life and invertebrates typical of the region. Divers should be prepared for deep water and potential overhead environments.

Nee Islets, located at the mouth of Doubtful Sound, features a diverse topography of reefs, walls, and kelp forests. Divers and snorkellers can explore depths ranging from 5 to 40 metres, with an average depth of 20 metres. The site is characterised by a distinct freshwater layer floating above the colder saltwater, which can impact visibility, typically ranging between 5 and 20 metres. Access is by boat only, and the site is suited to intermediate divers due to moderate currents and potential hazards including cold water, entanglement, and low visibility. The islets are also known for hosting a colony of New Zealand fur seals.