Sandra's is a shallow, sheltered mooring on Saxon Reef, and Divers Den describes it as a beautiful shallow reef dive with a wide range of anemonefish, ideal for snorkellers. An extensive sandy bay stretches out from the reef, and scattered across it are coral islands, isolated heads of hard and soft coral rising from the sand, each a small ecosystem of its own. The anemones on these coral islands host several species of anemonefish, which is one of the site's signatures: patient divers can find orange-fin, spine-cheek, clark's and pink anemonefish in a single dive.

Whitetip reef sharks rest on the sand during the day and can be approached carefully, and schools of yellowfin barracuda cruise over the bay. Cuttlefish and turtles are also regularly seen, and garden eels colonise the sand in places. The water is shallow and the conditions calm, so the site is excellent for snorkellers, introductory divers and newly certified divers, and for anyone who wants a long, relaxed dive with plenty of natural light.

Photographers will find the coral islands make neat, self-contained subjects against white sand. For those who want more depth, Sandra's Peaks, a pair of offshore peaks with a valley between them, are a short swim from the boat and have their own entry. Norman Reef also has a site called Sandra's, on a shallow shelf with a deep wall; the two are unrelated.

Visibility is typically 12-18 m, and the white sand makes the bay bright even on overcast days. It is one of the best sites on Saxon for a first reef experience.

Boat access only. Cairns day boats leave from the Reef Fleet Terminal (1 Spence Street) and the neighbouring Marlin Marina on the city waterfront, with check-in between about 7:00 and 8:00 am; most operators run transfers from city and northern-beaches accommodation, and there is paid parking near the terminal. The run of about 55 km out through Trinity Inlet and across the lagoon to Saxon Reef takes around 75 minutes on a fast catamaran and noticeably longer on slower dive boats or into a south-easterly chop.

Sandra's is a Divers Den mooring on Saxon, also used by other northern-reef boats. Enter from the stern platform into the sandy bay.

The prevailing south-east trade winds (typically 15-25 knots from April to September) are what limit Cairns outer-reef diving: above about 25 knots trips may be cancelled, and exposed eastern moorings are used only in light winds. Summer northerlies are gentler but make north-facing moorings choppy. Box jellyfish and Irukandji are present from about November to May (stinger suits on every dive), and the cyclone season runs November to April, when a system in the Coral Sea can close the reef for days.

Visibility drops after heavy rain and strong winds; spring is usually calmest and clearest. Saxon's western lagoons are sheltered; its weather side is dived only in calm conditions. Sandra's is one of the sheltered western moorings and is usable on most trade-wind days.

Descend into the bay at 5-8 m and work from one coral island to the next, checking anemones for different anemonefish species and the sand for resting whitetip sharks. Head offshore to Sandra's Peaks if deeper diving is planned; otherwise return to the boat through the shallow coral.

Divers Den (Reef Quest, Ocean Quest) – regular; other Saxon operators occasionally; Saxon is also worked by Divers Den, Reef Experience, Down Under Cruise & Dive, Tusa Reef Tours, Aqua Quest and Reef Encounter; the mooring used on any day is chosen by the skipper according to wind, tide and other boats