Penfield Lighthouse in the Long Island Sound is an artificial reef site suitable for intermediate divers. The site features depths ranging from 6 to 10 metres, with an average depth of 7 metres. Access is via shore, though the site is located 1770 metres from the coast. Divers should be prepared for strong currents and variable visibility between 2 and 6 metres. Water temperatures fluctuate significantly throughout the year, ranging from 3°C in February to 22°C in August. Hazards at this location include boat traffic, entanglement risks, and surf. Facilities available near the site include parking and a cafe. Typical dive times at this location are approximately 45 minutes.

Green Ledge Lighthouse in Long Island Sound serves as an artificial reef, providing a distinct diving environment around the lighthouse structure. The site reaches depths between 3 and 21 metres, with an average depth of 3 metres. Access is exclusively by boat, as the location sits 1609 metres from the shore. Divers should anticipate moderate currents and remain cautious of boat traffic and potential entanglement hazards. The habitat supports a variety of temperate marine life, including reef fish and invertebrates typical of the region. Due to the prevailing conditions and navigation requirements, this site is suited for intermediate divers.

Smithtown Reef is an artificial reef and wreck site located in the Long Island Sound. The site sits at depths between 9 and 12 metres, with an average depth of 11 metres. It is accessible only by boat and is suitable for beginner divers. Conditions include mild currents and variable visibility ranging from 5 to 15 metres. Divers should maintain awareness of potential entanglement hazards when navigating the artificial structures and wreck elements. Typical dive times are approximately 40 minutes. Water temperatures fluctuate significantly throughout the year, ranging from 3C in February to 23C in August.

Cedar Beach in the Long Island Sound is a shore-entry reef site suitable for beginners. Divers can explore depths ranging from 2 to 15 metres, with an average depth of 15 metres. Conditions vary, with visibility between 2 and 15 metres and moderate currents. Water temperatures fluctuate significantly throughout the year, ranging from 3C in February to 21C in August. Typical dive times are approximately 40 minutes. The site supports a variety of temperate marine life and invertebrates typical of the region. Due to the location, divers should remain aware of boat traffic. Parking is available at the site, and guided tours are offered for those requiring assistance.

The Gwendolyn Steers is a shipwreck located 2000 metres off the coast of Long Island in the Long Island Sound. Resting at depths between 6 and 30 metres with an average of 15 metres, this artificial reef is accessible only by boat. Divers encounter mild currents, though visibility is variable, ranging from 5 to 15 metres. The site requires intermediate skill due to potential surge and swell, particularly in the shallower sections. Boat traffic is frequent in the area, necessitating the use of a surface marker buoy during ascents. Guided tours and boat charters are available through local dive shops to support site planning and access.

Lloyd Neck is a shallow reef site in Long Island Sound, offering a shore entry suitable for beginner divers. The site features depths ranging from 2 to 6 metres with visibility typically around 5 metres. Divers should be aware of moderate currents that can strengthen, requiring careful planning to enter against the flow. Water temperatures fluctuate significantly throughout the year, ranging from 3C in winter to 23C in summer, necessitating appropriate thermal protection. Due to frequent boat traffic in the area, divers must use high visibility markers at all times. Parking is available on-site, though visitors should check local boating schedules as traffic increases during weekends and warmer months.

Sound Beach is a shallow shore dive in Long Island Sound, featuring a mix of natural and artificial reef structures. The site is suitable for beginners, with depths ranging from 3 to 6 metres and an average depth of 4 metres. Divers should be prepared for strong currents and variable visibility between 5 and 10 metres. Entry requires caution due to surf, shore break, and potential hazards including sharp rocks and sea urchins. Protective footwear is essential. The area experiences significant boat traffic, so maintain awareness during your dive. Facilities at the site include parking, toilets, showers, changing rooms, and a rinse station.

Shoreham Jetties is an artificial reef located in the Long Island Sound, featuring a jetty structure with pilings and rocky surfaces. This site is suitable for beginner divers, with depths ranging from 3 to 5 metres. Entry is from the shore, requiring navigation through surf and shore break. Divers should be prepared for mild currents, though stronger or rip currents can occur. Visibility typically ranges from 1 to 3 metres. Night diving is permitted at this location. Parking is available on site. Divers are advised to wear protective gear to avoid contact with sharp rocks and to be aware of potential entanglement risks.