The Other Playground is the companion mark to The Playground, 107 m to its north-east on the same stretch of wall just inside the western side of Port Phillip Heads. The Scuba Doctor listing gives it the same 15–50 m depth range, the same 'dive only on SWF' (slack water at end of flood) restriction and the same 'Advanced Open Water and beyond' rating, and the name says the rest: it is a second drop on the same feature, used when a boat has already dived The Playground or wants an untouched section.

The wall here is the continuation of the east–west face that forms the northern bank of the entrance channel on the Lonsdale side. The reef top is at about 15 m, sloping kelp and sponge-covered limestone, and the face falls in the usual Heads steps to around 50 m. The listing carries no separate description, and what is known comes from the adjoining sites: small caves and overhangs along the face, dense encrusting cover, crayfish under the ledges, and the blue devils, boarfish and sweep of the wall system generally.

It is rarely on a commercial schedule. Club and technical boats dive it on flood slacks when the entrance is calm, and it should be regarded as a site for experienced deep-wall divers with a skipper who knows the mark. The combination of depth, position in the channel and a single usable slack each tidal cycle makes it one of the more demanding drops at the Heads, and one of the quietest.

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 15 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 15 minutes to the site.

The site is north-east of The Playground near the western side of the entrance. 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 at the end of the flood (SWF), so that any current after the turn carries divers back into the bay rather than out through The Rip. 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.

Being outside or right at the entrance, it is exposed to Bass Strait swell: anything over about 1.5 m from the south-west or south, or a strong southerly/westerly wind against the ebb, produces standing waves in The Rip and charters cancel. Northerlies flatten the entrance and give the best days. 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.

As for The Playground: shot onto the 15 m reef top at the start of the flood slack, drop the wall to the planned maximum, work the face and return to the lip before the flood resumes; DSMB and drift inside for stops.

As for The Playground: 50 m base, trimix below 40 m, drift deco under DSMB.

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.