The Janet is the least visible of the Transit Reef wrecks but has an interesting story. Built of jarrah at Fremantle in 1878, she was a 33 m, 211-ton three-masted schooner (described as a cutter in some records) and at the time of her loss was the largest vessel belonging to the port of Fremantle. Returning from Colombo with wheat and furniture, she struck the reef on the evening of 11 December 1887, close to where the Macedon had been lost four years earlier. The crew were found clinging to the masts and were rescued after the pilot station saw their distress signals; by morning the ship was a total wreck.

No wooden hull remains. What divers find are two admiralty anchors, a davit, a boiler and lengths of piping scattered across the reef and sand in 3-7 m, plus a small cave system at the site with a maximum depth of about 7 m. Sand regularly covers much of the wreckage, so on some visits there is little to see and on others more of the site is exposed. A WA Museum plinth and plaque mark the site as part of the Rottnest wreck trail.

The Janet is best treated as an add-on to the Macedon and Denton Holme rather than a destination on its own: it adds history and a couple of anchors to a dive that is already rich in structure. It lies within the Kingston Sanctuary Zone, where fish are unfished and relatively tame, and suits the same beginner and snorkelling audience as its neighbours.

Rottnest lies about 18 km west of Fremantle. Perth charter boats (Perth Scuba's Blue Destiny and Bucket List Diver) leave Fremantle in the morning and reach Thomson Bay in about 45-60 minutes; the Transit Reef wrecks are usually picked up on a mooring just outside the bay as a second, shallow dive. Private boats launch at Fremantle, Woodman Point or Hillarys and should use a public mooring rather than anchor inside the Kingston Sanctuary Zone.

It is also possible to catch the Rottnest Express or SeaLink ferry to the main jetty and kayak or make a long surface swim north from the Thomson Bay beach, but the route crosses a busy boat channel and a tow float and flag are essential.

Same shelter as the other Transit Reef wrecks: protected from south-westerly swell and sea breezes but exposed to north-westerly winds and winter storms; keep swell below about 2 m. The wreck is frequently buried by moving sand, so how much can be seen varies from season to season. Best on calm mornings.

Start at the Macedon mooring, swim east along the reef on a compass bearing for about 80-150 m to find the anchors and boiler, explore the small cave system (to 7 m), then return to the mooring. On a dedicated dive, anchor on sand clear of the reef and search in a slow circle from the plaque.

Usually visited as an extension of the Macedon/Denton Holme dive by Perth Scuba, Bucket List Diver and Dolphin Scuba when conditions allow; private boats and dive clubs.