Jacko's Cave lies at Leatherjacket Point, just south of the two scuttled tugs off Red Point in Twofold Bay. McFadyen rates it one of the best reef dives he has done anywhere, alongside the Poor Knights, Fish Rock Cave, Stony Creek in Jervis Bay and Burrill Rocks at Ulladulla. A bombora rises from more than 20 m to within 4 m of the surface a few metres off the point. Divers descend beside a vertical wall that drops from 6 m to about 17 m and runs north–south before turning east and then south again.

At the corner, behind some very large boulders, is what looks at first like a big overhang. It is in fact a cave that opens into a huge, low cavern wide enough to hold a couple of large boats. Small overhangs at the front shelter cuttlefish and eastern blue devilfish, and dozens of hermit crabs walk over the sand and rocks. The cave then narrows in height to 1–1.5 m while staying about 4 m wide, runs 20 m to a larger chamber (6 m wide and 2–2.5 m high), and continues very low and dark for about another 10 m before the far exit comes into view. McFadyen warns this is much harder than Fish Rock Cave and not for anyone claustrophobic or large; a better option for most divers is to stay in the lit front section. The Marine Life Network describes a small cave a few metres wide and about 40 m long that requires a torch.

Outside, the walls and boulders are covered in brilliant sponges, sea squirts, gorgonians and lace coral, with nudibranchs, octopus and cuttlefish. Six-spined and black reef leatherjackets swarm around the cave mouth, and a large ray is resident at the far entrance. Depths are 4 m on the reef top, 10–15 m along the tunnel, 17–18 m at the mouth and 22 m on the sand.

Boat access only, and only in very calm seas. From Eden it is less than 10 minutes south across Twofold Bay, just past the Tasman Hauler and Henry Bolte, to Leatherjacket Point. Anchor at McFadyen's mark just off the point, which places divers above the wall.

Merimbula Divers Lodge runs it (as 'The Cave') for divers with cave or cavern experience.

The bombora comes to within 4 m of the surface, so the site can only be dived in very calm seas; McFadyen dived it on a millpond day with a strong westerly blowing. Any easterly or north-easterly swell makes it unsafe. Visibility is normally good (20 m or more).

Water is comfortable in summer and autumn, cooler in winter and spring.

Descend to the wall (6–17 m) and follow it to the corner where it turns east; the cave mouth is behind large boulders at 17–18 m. Enter the large front cavern, then only if trained continue through the low section (1–1.5 m high, 4 m wide) for 20 m to a second chamber and about 10 m more of darkness to the far exit. Explore the wall at the exit, return over the reef, then follow the main wall right through the sponge-covered boulders before a safety stop on the reef top.

Through-trip is a true overhead environment with restrictions (≈1 m high); use a guideline and redundant lights if venturing beyond daylight.

Merimbula Divers Lodge lists 'The Cave' (20 m, Open Water + cave experience, two divers at a time) and McFadyen says it is the only operator that dives it; Dive Eden runs cave dives in Twofold Bay on demand.