The Troy D is Tasmania's only purpose-scuttled dive wreck on the east coast. According to The Examiner, the 1000-tonne coastal trader was deliberately sunk in 2007, about two kilometres off Maria Island, at an estimated cost of $1 million. Wikipedia places it 1.7 km west-south-west of the Painted Cliffs, outside the marine section of the national park. Discover Tasmania lists it as a feature of Maria Island diving and mentions cuttlefish on the wreck, and the Spirit of Tasmania guide says divers can explore the engine room and bridge.

The project has not been a success as a tourism attraction. In 2016 East Coast Tourism's chief executive told The Examiner that the Troy D had been sunk far too deep for anyone but skilled divers to reach, that it had received no marketing and that nobody had much to do with it because of its limited commercial opportunities. It remains rarely dived, although Go Dive Tasmania has published video of a dive on it.

Reliable published depths are hard to find: one aggregator claims 27 m, while the Examiner comments imply the wreck is beyond comfortable recreational limits. Divers should obtain a depth from a sounder on the day and plan accordingly. Expect a steel hull colonised by sponges, ascidians and weed, with schools of fish, cuttlefish and possibly seals from the Maria Island colonies.

The Troy D suits experienced wreck divers with deep training and their own boat or a club trip. It is an interesting site for its rarity and potential, but not a beginner dive.

Triabunna, on the Tasman Highway 1 hr 15 min (85 km) north-east of Hobart, is the gateway. The Maria Island passenger ferry (Encounter Maria Island) runs several times daily from Triabunna to the Darlington jetty, about 16 km and roughly 30-45 minutes; it carries people and small amounts of luggage but not vehicles, and dive cylinders should be cleared with the operator first. Private boats launch at the Triabunna ramp (best), Saltworks Road ramp, or Orford (shallow bar at the Prosser River mouth - difficult at low tide).

The Troy D lies in Mercury Passage about 2 km off Maria Island's western shore, roughly 20-30 minutes by boat from Triabunna. There is no public mooring information; divers use a GPS mark and shot line.

Maria Island's western and northern shores (Darlington, Fossil Cliffs, Painted Cliffs) are sheltered from easterly ocean swell but exposed to strong westerlies and north-westerlies blowing across Mercury Passage, which are common in winter and spring. The eastern side (Mistaken Cape, Bunker Bay) faces the open Tasman Sea and needs westerly weather and small swell. Southerly swell wraps around Cape Peron and the southern end.

Visibility drops after rain as runoff flows from the Prosser River into Mercury Passage. Mercury Passage is sheltered from ocean swell but becomes rough in strong westerlies and north-westerlies. Tidal flow through the passage can create current on the wreck; slack water is preferable.

Descend the shot to the wreck, check depth immediately and plan a short no-decompression tour of the upper structure (bridge and deck), ascending the shot for a long safety stop. Only trained, equipped wreck divers should consider entering the engine room.

Plan on nitrox at minimum; confirm depth before diving. Penetration requires wreck training, guideline and redundant lights.

No operator based on Maria Island. Hobart shops run occasional trips: Go Dive Tasmania has offered Ile des Phoques seal dives and filmed Troy D dives; Tasmanian Scuba Diving Club and Tas Uni Dive Club run club trips from Triabunna. Most diving is from private boats.