Finger Bay is a deeply recessed, protected bay located on Adak Island. It offers relatively stable conditions for both diving and snorkelling in the central Aleutians. Divers and snorkellers can access the site from the shore or by boat. Water temperatures are cold, ranging from 4C to 9C throughout the year. Due to the environment, divers should be prepared for cold water, potential entanglement hazards, and variable visibility. The site features parking facilities for visitors. It is recommended for advanced divers due to the challenging water temperatures and environmental conditions.

Clam Lagoon is a shallow, brackish body of water located on the north end of Adak Island in the United States. This site remains ice-free throughout the year, providing a rare opportunity for surface-level observation in the region. Snorkellers should be aware that conditions can be challenging, with moderate currents and surf present. Due to the nature of the environment and the potential for strong currents, this site is best suited for intermediate-level snorkellers. Water temperatures are cold, ranging from 4°C to 9°C depending on the month. Access to the water is via the shore.