Meet the site
Roach Island is described by Diveplanit as the largest of the group of seven Admiralty Islets – other sources give that title to Sugarloaf, so treat the claim with care – and it is the anchor point for several of the northern dives. Diveplanit's survey covers the Admiralty sites together, with a top around 18 m, a median depth of 22 m and a bottom around 30 m. It describes steep drop-offs presented as walls of coral, bommies and large boulders, and swim-throughs where the islands meet below the surface. Flat Rock, a low rock beside Roach Island, is dived as part of the same complex.
The reef here is typical of the Admiralty Islets: hard coral and gorgonian fans on the rock, boulders and gutters on the slopes, and sand at the base. Diveplanit's divers recorded tasselled flathead, mosaic moray, black-and-white lionfish including juveniles, dusky hydroids, gorgonian fans, blue nudibranchs and painted morwong, plus an unusual bannerfish-like species. Galapagos sharks are the most common large animal, and kingfish, trevally and drummer school along the edges. Occasional mega fauna – turtles, rays and passing pelagics – turn up as well.
Because there are several faces to choose from, operators use Roach Island in a range of conditions, diving the side sheltered from the day's wind. The swim-throughs are a highlight and are generally wide and short, but they surge in north-east swell. Roach Wall, dived by Nigel Marsh, is the island's steeper face and is listed as its own site here.
The dive suits Open Water divers in calm conditions, with Advanced certification preferred because the walls pass 20 m. It is a scenic dive with both macro and occasional big-animal interest.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Roach Island / Flat Rock is recorded as Island in Lord Howe Island. The listed access is boat (day trip). Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Current and timing
- Ask how the operator assesses the current window for the actual route. Historical tide notes are not a departure instruction.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- Lines and obstructions
- Discuss any known entanglement concerns and the suitability of the planned area.
- Water movement
- Ask how swell and local exposure affect the proposed entry, exit and route.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Roach Island / Flat Rock suitable for my certification?
The record lists Advanced Open Water. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Roach Island / Flat Rock through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Galapagos sharks, kingfish, trevally, drummer, mosaic moray, black-and-white lionfish, tasselled flathead, painted morwong, blue nudibranchs, dusky hydroids, gorgonian fans, hard corals
Location
Reefs, boulders and swim-throughs around Roach Island, the largest of the seven Admiralty Islets, and the adjacent Flat Rock.
Facilities nearby
Departure from the Lagoon Road boatsheds.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
diveplanit.comdivernet.comprodive.com.auRecord updated 27 Sept 2026. Source claims are being reviewed.