Meet the site
The John Holland Barge is the anchor structure of the harbour's refugee-boat reef. It was a steel construction barge from the John Holland company, built around a row of cylinders about 2 m in diameter connected by heavy steel beams that once carried a working platform, a deckhouse and a small work boat. DSAC gives its size as 18 by 12 m and the year sunk as 1982; marinelife.org.au describes it as a steel dumb barge of over 200 ft sunk in July 1984. Between 1976 and 1981 more than 50 boats carrying Vietnamese refugees reached Australia's northern coast, most of them arriving in Darwin Harbour. Several of the steel boats were later cleaned and scuttled west of Cullen Bay together with a redundant construction barge to create a fishing and diving reef, and the site was extended in later years with a confiscated illegal fishing boat. The group sits in 20-25 m within a few hundred metres, and some operators have linked the wrecks with rope so that more than one can be visited on a dive.
The barge landed upside down on the bottom in 21-25 m, so divers now see the cylinders and the web of beams from below, creating a maze of overhangs and gaps rather than a flat deck. That shelter is what the fish like. Glasseyes hang in the shadows, rays and wobbegongs rest under the beams, and angelfish, snapper, bream, cod, jewfish, trevally and octopus are all recorded. It is a good site for photographers looking for structure and for divers who enjoy poking into nooks with a torch without entering an enclosed wreck. With the Song Saigon and Ham Luong within easy reach, it is typically the middle stop of a multi-wreck dive on the complex.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
John Holland Barge is recorded as Wreck in Darwin Harbour. 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.
- 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.
- 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 John Holland Barge 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 John Holland Barge 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
Glasseyes, rays, black jewfish, wobbegong sharks, angelfish, golden snapper, bream, estuary cod, trevally, octopus
Location
Outer Darwin Harbour west of Cullen Bay, beside the Song Saigon and Ham Luong refugee boats.
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
nt.gov.audsac.com.aumarinelife.org.auRecord updated 26 Sept 2026. Source claims are being reviewed.