Knawesome Bommie – also called Al's Bommie, after the diver who put it on the chart – is a big pinnacle standing in the shipping channel off Shortland Bluff. The Scuba Doctor listing, with GPS from Allie Beckhurst, describes 'a large bommie [that] rises from 40 metres to 22 metres with lots of other smaller ones scattered around it', and says that despite its position in the channel it is 'teeming with marine life and a fantastic area for taking photographs'. Its distinguishing feature is 'a large ship's anchor heavily encrusted into a section' of the bommie – a relic of the channel's shipping history that has been there long enough to be part of the rock.

The main bommie is 18 m high, with soft corals, sponges and gorgonian fans over its faces, overhanging ledges and small caves around its base and flanks, and the smaller bommies around it forming a field of structure on the 40 m sand. The fish are those of the deeper channel reefs: southern blue devils in the caves, magpie morwong and boarfish along the ledges, and schools of pike hanging off the top in the current; crayfish are 'known to be caught in the area', and because the site lies outside the marine national park boundary that remains legal for licensed divers, unlike the Lonsdale sites.

The depth profile – 22 m on top, 40 m at the sand – puts it in the deep-Advanced band, and the channel position imposes the usual conditions: slack water, shipping report, no anchoring, live boat and DSMBs. It is dived by experienced groups and clubs rather than as a scheduled charter drop, usually with Awesome Reef 100 m away, and it is one of the better photographic sites on the Queenscliff side for those who can handle the depth.

Boat access only. Charter boats leave from Portsea Pier (Dive Victoria Group, Bayplay) and Queenscliff Harbour (Dive Victoria Group, Red Boats); run time is about 10 minutes. Private boats launch at Sorrento Boat Ramp (Point Nepean Road, Sorrento, all-tide concrete ramp with trailer parking) or Queenscliff Boat Harbour ramp (Larkin Parade, Queenscliff), roughly 8 minutes to the site.

The site is in the shipping channel off Shortland Bluff, 8 minutes from Queenscliff Harbour; GPS from Allie Beckhurst, verified. Skippers must call Lonsdale VTS (Point Lonsdale) or listen to VHF 12 for shipping movements before dropping divers, and must carry a dive flag; anchoring is not permitted in the shipping channel, so a live boat and a drop-shot or drift float is the normal method.

It is dived only on slack water, either at the end of the flood (SWF) or the end of the ebb (SWE); most operators prefer the flood slack so that any residual current sets into the bay rather than out to sea. Slack water at Port Phillip Heads does not coincide with high or low water: it falls roughly three hours after high or low water at Point Lonsdale, and the usable window is typically 20–40 minutes. Use the Ports Victoria / Port of Melbourne slack-water predictions for The Heads (also republished by charter operators and WillyWeather 'Rip Bank') rather than a standard tide table.

Inside the Heads it is sheltered from most swell, but a south-west swell over about 2 m still surges across the top of the wall and a westerly or south-westerly wind over 15–20 knots makes the boat work unpleasant; big seas outside drop visibility to a few metres for a day or two. Visibility is best in late summer and autumn (Feb–May) when the water is clear and the westerlies have eased; winter brings 11–13 °C water and bigger swells but often the clearest days after a run of settled weather. Heavy rain has little effect this close to the ocean.

In the channel: shipping report mandatory, no anchoring.

Shot onto the top of the main bommie at 22 m at slack. Circle it at 25–30 m to find the encrusted ship's anchor set into its side and the overhanging ledges and small caves, drop to the sand at 35–40 m briefly if trained, then visit the smaller bommies around it before climbing back to the top for a DSMB ascent.

Sand at 40 m; nitrox 28% for the 25–30 m band; shipping channel – tracking boat and DSMB mandatory.

Dive Victoria Group (Portsea/Queenscliff) – runs the deep Heads walls for advanced and technical divers on suitable slack-water days; Red Boats (Queenscliff) – deep-wall and technical charters on request; otherwise private club boats (VSAG, Power House Underwater Club, Scuba Diving Melbourne). Not a routine training-boat site.