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Jon Lines / Reef Hooks

A Jon Line is an absolute must for divers decompressing in high current areas but who don't have the option of doing a drifting deco. A Jon Line is attached to the diver and then clipped to a shot line so the diver needn't spend any energy holding onto the shot/anchor line themselves. Plus a Jon line enables more divers to be at same depth on the shot/anchor line without crowding each other.

There's no point in trying to go against the flow. A reef hook lets you attach yourself to a reef or other structure in a current and stay in the same place without exertion. It leaves your hands free for underwater photography and videos.

We have some great Jon lines and reef hooks for scuba diving available from The Scuba Doctor dive shop.

Lonsdale Wall

Wall Dive Wall Dive | Boat access Boat access

Advanced Open Water Rated Deep Rated Inside Port Phillip Marine Park - No Fishing Open Water Rated Reef Dive Site Slack Water Technical Rated

Lonsdale Wall
Lonsdale Wall | © Phil Watson

Depth: 12 m (39 ft) to 38 m (125 ft)

The Lonsdale Wall dive site is but one of the many spectacular dive sites on Lonsdale Wall. The tidal flow in and out of Port Phillip each day means this site is in high-velocity waters providing plenty of nutrients for the marine life that densely covers Lonsdale Wall. Thus this site should be dived on the short window of slack water. Dive charter boats operating out of Portsea and Queenscliff regularly schedule this dive site, or one of the other dive sites on Lonsdale Wall. Private dive boats usually head out to Lonsdale Wall from the Sorrento or Queenscliff boat ramps.

The Swim Through, by Jane Headley.

Tom Wende diving Lonsdale Wall
Tom Wende diving Lonsdale Wall
© Sonar Wetsuits

Lonsdale Wall has overhangs and ledges and undercuts providing sanctuary to an enormous variety of fish including the spectacular Southern Blue Devil, Leather Jackets, Dusky Morwong, Southern Hulafish, Old Wives plus Southern Rock Lobster (aka Crayfish) and Giant Australian Cuttlefish. Occasional sightings of a Port Jackson Shark snoozing under a ledge, or and if you are really lucky you may even spot a Gulf Wobbegong or Sharpnose Sevengill Shark cruising slowly along the wall. Colourful growth in the form of soft corals, sponges, hanging sea fans in bright yellow, orange and other varieties in pink and burgundy. At least four different species of Nudibranchs and Seastars can be found here if you look closely.

As you descend down Lonsdale Wall there is a slight step out every 6 to 9 metres or so, and behind each step-out, there is a huge overhang. Shining a torch under these ledges will reveal a myriad of life and colour, with sections carpeted in Yellow Zoanthid Anemone like a field of yellow daisies.

Divers need to be careful as they descend on Lonsdale Wall. The next terrace down may appear not so far, but before you know it, you can be unintentionally in very deep water. Because of the strong currents caused by fast tidal flow near The Heads, Lonsdale Wall is dived on slack water. Dives are usually limited to 20 to 30 minutes of slack water. Slack water is halfway between high and low water.

Lonsdale Wall from Allie Beckhurst on Vimeo.

Dive charter boats regularly schedule dives on Lonsdale Wall, heading out from Portsea and Queenscliff. Private dive boats usually launch at the Sorrento Boat Ramp or the Queenscliff Boat Ramp.

The Rip & Tides Warning: Always keep an eye on sea conditions throughout any shore or boat dive within "The Rip" (aka "The Heads"). This is a dangerous stretch of water, where Bass Straight meets Port Phillip, which has claimed many ships and lives. Please read the warnings on the web page diving-the-rip before diving or snorkelling this site.

Lonsdale Wall

This dive site is one of many on Lonsdale Wall, located just inside The Heads on the Lonsdale side of Port Philip — one of Australia's premier dive locations. Lonsdale Wall is one side of an underwater canyon formed by the old Yarra River as it flowed out to sea through the plains, carving steep-walled edges out of soft rock sides. Between the end of the last Ice Age around 8000 BCE and around 6000 BCE, the sea-level rose to drown what was then the lower reaches of the Yarra River. Thus the canyon formed by the river near what is now The Heads, or The Rip, was flooded creating the Lonsdale Wall, North Wall and Nepean Wall areas. Lonsdale Wall extends for one kilometre, providing many spectacular dive sites. An almost vertical drop characterises Lonsdale Wall with the wall starting as shallow as 8 m (26 ft) metres deep in places and sometimes dropping down to well over 60 m (197 ft) deep. See also, Port of Melbourne Rip Map — Oblique seabed image of The Heads produced by hydrographic surveys.

Wathaurong (Wadda-Warrung) country
Wathaurong (Wadda-Warrung) country

Traditional Owners — This dive site is in the traditional Country of the Wathaurong (Wadda-Warrung) people of the Kulin Nation. This truly ancient Country includes the coastline of Port Phillip, from the Werribee River in the north-east, the Bellarine Peninsula, and down to Cape Otway in the south-west. We wish to acknowledge the Wathaurong as Traditional Owners. We pay respect to their Ancestors and their Elders, past, present and emerging. We acknowledge Bunjil the Creator Spirit of this beautiful land, who travels as an eagle, and Waarn, who protects the waterways and travels as a crow, and thank them for continuing to watch over this Country today and beyond.


Lonsdale Wall Location Map

Latitude: 38° 17.487′ S   (38.29145° S / 38° 17′ 29.22″ S)
Longitude: 144° 37.797′ E   (144.62995° E / 144° 37′ 47.82″ E)

Datum: WGS84 | Google Map
Added: 2019-03-16 08:04:51 GMT, Last updated: 2022-04-06 21:20:34 GMT
Source: Packo
Nearest Neighbour: The Mall, 81 m, bearing 38°, NE
Depth: 12 to 38 m.
Dive only on: SWF, SWE.

DISCLAIMER: No claim is made by The Scuba Doctor as to the accuracy of the dive site coordinates listed here. Should anyone decide to use these GPS marks to locate and dive on a site, they do so entirely at their own risk. Always verify against other sources.

The marks come from numerous sources including commercial operators, independent dive clubs, reference works, and active divers. Some are known to be accurate, while others may not be. Some GPS marks may even have come from maps using the AGD66 datum, and thus may need be converted to the WGS84 datum. To distinguish between the possible accuracy of the dive site marks, we've tried to give each mark a source of GPS, Google Earth, or unknown.


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