Seringapatam Reef is an egg-shaped atoll of about 55 km², with a narrow reef rim enclosing a deep lagoon, large boulders on its edges and sandbanks on the west side. It was found by Captain Edwin Courtenay on 23 August 1839 and named after his ship. Like Scott Reef, it rises steeply from 400–500 m, and it shares Scott Reef's history of severe bleaching.

Few recreational divers have visited; expect pristine-feeling walls, pelagics and sharks, and a total dependence on the expedition vessel.

Kimberley diving context: the Kimberley coast between Broome and Wyndham is one of the least-dived coastlines in Australia. Huge tides (up to 10–11 m), turbid inshore water, saltwater crocodiles around the islands and rivers, and large sharks mean that inshore diving is generally discouraged by experienced local boaters, and expedition cruise ships mostly offer snorkelling or Zodiac excursions rather than scuba. The serious diving is offshore, on atolls and island reefs far from river run-off, visited on a handful of liveaboard departures a year from Broome or Darwin. Medical help is many hours away; divers should be conservative and carry DAN or equivalent evacuation cover.

Planning notes: Advanced Open Water certification is recommended and the site is rated advanced. Expect to spend most of the dive around 18 m, with a maximum of about 40 m. It can only be reached on a multi-day expedition or liveaboard, so it is usually one of several sites dived on the trip and choices are made by the crew on the day. Currents are significant, so timing around the tide is part of the plan. Best season: September–November (calmest window). Traffic: remote/expedition only.

Only by expedition liveaboard or private ocean-going vessel, usually combined with Scott Reef, 1–2 days from Broome or Darwin. Expedition vessels typically depart Broome or Darwin (or Wyndham) on 10–14 night Kimberley voyages, or on dedicated 7–12 night reef expeditions; private vessels need full offshore capability, long-range communications (satphone/EPIRB) and fuel for several hundred nautical miles. Dives are run from tenders launched from the mothership, which anchors in the lee of the reef.

Kimberley offshore trips run in the dry season (roughly April–October; Scott Reef and Rowley trips cluster September–November when winds ease). The wet season (November–April) brings cyclones, and the Kimberley coast has tides up to 10–11 m, creating violent currents, whirlpools and tidal races near the mainland and inshore reefs. Offshore atolls have smaller ranges but strong currents in channels.

Strong easterly trade winds in mid-dry season can make crossings rough.

Dive the outer wall on the lee side with the current, 15–30 m, ascending onto the reef rim.

Occasional expedition liveaboards only.