The Marina Star is a fishing trawler that sank in 2000 and now lies in about 60 m roughly a kilometre east of Point Perpendicular, off the northern entrance to Jervis Bay. According to the South Coast Register's survey of local shipwrecks, it has become a popular site with experienced divers, and navigational and other instruments are still visible inside the hull.

Beyond that, published detail is scarce: the main dive-site references for Jervis Bay do not describe the wreck's orientation or condition, and exact marks are not in the public domain. Divers should expect a relatively intact modern steel trawler that attracts schooling fish and pelagics in the clear water outside the bay, with encrusting sponges and sea whips colonising the structure over two decades.

At around 60 m this is a technical dive only. It requires trimix to manage narcosis and oxygen toxicity, a substantial decompression plan with travel and decompression gases, and a support boat that can follow divers who drift during ascent. Penetration of the hull should only be attempted by divers with overhead-environment training, because trawler interiors contain entanglement hazards such as cables and nets. The site also lies close to the Beecroft Weapons Range sea area, which can be closed during firing. It is included here for completeness as one of the few deep wrecks in the region, but confidence in the details is low and the site should be verified with local technical divers. Deep sites off the bay entrance also carry a long evacuation time to the Sydney chamber, which should be factored into any decompression plan.

Launch at Huskisson (Currambene Creek) or Callala Bay and cross the bay to the entrance, then run about 1 km east of Point Perpendicular (roughly 25–30 minutes). Marks are held by local technical divers and operators; use a sounder to locate the hull and drop a shot line. Check Beecroft Weapons Range sea-area closures before departing.

Carry VHF radio, oxygen and a recall system, and leave a skipper aboard throughout the dive and decompression.

The outer Beecroft Peninsula cliffs face east to south-east and take the full force of any south-easterly or easterly swell; the sites are diveable in swell under about 1.5 m and are well sheltered from south-westerly and westerly winds, which make them the go-to sites in winter. North-easterly winds (common on summer afternoons) make the run from Huskisson across the bay entrance rough and cause surge on the northern-facing cliffs. Visibility is commonly 15–25 m and can reach 30 m in winter when clear oceanic water sits against the peninsula.

Currents along the cliffs are usually mild but can run at the bay entrance on a strong tide change. Defence live-firing closures can shut the sea area – check before going. At 60 m, bottom conditions can differ from the surface, and current at the bay entrance can make shot-line work difficult.

Descend the shot to the wreck, survey the hull and wheelhouse area within the planned bottom time, then ascend the shot or on a DSMB with staged decompression on richer mixes.

Trimix (e.g. 15/55 or 18/45) with EAN50 and oxygen for decompression; shot line and support boat essential; overhead training for any penetration.

No regular operator; technical diving groups by arrangement with Jervis Bay operators or on private boats.