Meet the site
The Crack is a drift dive along the northern side of Nepean Island, the small island off Kingston. Nigel Marsh describes a large bay with gutters and caves and 'a complete carpet of hard corals', which is a notable sight at 29 degrees south in the Tasman Sea.
The drift carries divers along the bay, and the gutters and caves provide places to stop and look. Marsh's species list is one of the richest recorded for Norfolk: yellow-banded wirrah, marblefish, bullseyes, morays, clown toby, three goldribbon cod on the one dive, black cod, scorpionfish, sea stars and nudibranchs. Green turtles are regular, and the reef fish include the doubleheader wrasse, other wrasses and the splendid hawkfish – several of them species shared with Lord Howe Island and northern New Zealand.
Black cod are a protected species and grow large where fishing pressure is low, and Norfolk's marine environment is described as unusually intact. Visibility at Nepean is often 30–40 m, which makes the coral carpet and the drift particularly scenic.
The dive is best suited to divers who have done drift dives before, as the current sets the pace and the boat picks up divers wherever they surface. Open Water divers with some experience will manage it with a guide. The caves are open overhangs rather than penetrations. As with all Nepean sites, it is dived when the southerly swell is down and the wind is light or northerly, and the boat launches from Kingston Pier, only a few minutes away. The exact depth range is not published; the figures here are estimates.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
The Crack (Nepean Island) is recorded as Drift in Norfolk 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.
- Water movement
- Ask how swell and local exposure affect the proposed entry, exit and route.
- Overhead environments
- Ask whether the plan stays entirely in open water. A wreck or cave listing is not permission or training to enter.
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 The Crack (Nepean Island) 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 The Crack (Nepean Island) 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
Goldribbon cod, black cod, yellow-banded wirrah, marblefish, bullseyes, morays, clown toby, scorpionfish, green turtles, doubleheader wrasse, splendid hawkfish, sea stars, nudibranchs, hard corals
Location
A large bay with gutters and caves on the northern side of Nepean Island, carpeted with hard coral and dived as a drift.
Facilities nearby
Departure from Kingston Pier (crane launch); public toilets at Emily Bay and Kingston.
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
nigelmarshphotography.comRecord updated 26 Sept 2026. Source claims are being reviewed.