Spider Cave is the most impressive cave on the southern side of the Jervis Bay entrance. It lies on the southern headland about a kilometre from the point nearest Bowen Island, where the cliff wall rises straight from 5–10 m close in to more than 25 m further out, with the reef edge near 30 m. The cave extends some 80–100 m back under the enormous cliff and has three entrances stacked one above another.

Divers typically enter at 24 m, ascend through the middle entrance at 21 m and then the top entrance at 17 m. Further in, a cavern section opens at 12 m, and the far end of the cave is at about 7 m. Deep 6 describes a 70–80 m overhead cave tapering to 16 m against the cliff face. Fish congregate near the entrances, and the sponge gardens on the wall outside are colourful; following the wall in either direction after the cave reveals boulders, overhangs and more reef.

This is a genuine overhead dive with narrow passages, so torches, gas planning and good buoyancy are essential, and cavern training is advisable for anyone going far inside. Access is the other limitation: charter boats rarely come this far from the bay mouth, and they need millpond seas; the best chance is a winter westerly spell. For experienced divers who get the conditions, it is one of the most memorable dives in Jervis Bay. The site is within Booderee National Park waters, where all marine life is protected.

Charters depart Huskisson (Dive Jervis Bay; boats in Currambene Creek). Private boats can launch at Murrays Beach ramp in Booderee National Park (park pass required), which is the closest ramp to the southern headland. From Murrays run out through the entrance between Bowen Island and the mainland only in flat seas at high tide (boats under 6.5 m), otherwise go around the north of Bowen Island; Spider Cave lies on the southern headland about 1 km from the point nearest Bowen Island; anchor at 35° 08.222' S 150° 45.870' E (about 25–30 minutes from Huskisson).

Charter boats rarely go this far and only in millpond seas, so a private boat may be needed.

The southern headland of Jervis Bay (Booderee National Park's ocean coast) faces east and south-east and takes the full force of southerly and south-easterly swell. These sites need swell under about 1–1.5 m and are best in westerly or north-westerly winds – typically winter – when the cliffs give a lee. North-easterly winds are generally fine on this coast but make the run back across the bay choppy.

Visibility is usually good (15–25 m) in oceanic water; currents can be strong further offshore. Deep 6 recommends Spider Cave in winter when westerly winds leave minimal or no swell; charter access requires millpond seas.

Enter via the lowest entrance at 24 m, rise through the middle entrance at 21 m to the top entrance at 17 m, continue to the cavern section at 12 m and the cave's far end at 7 m. Exit and follow the wall north or south among boulders and overhangs before returning to the anchor.

Cavern/cave: primary and backup torches; guideline recommended for deeper penetration; cavern training advisable.

Occasionally visited by Deep 6 Diving and Dive Jervis Bay in winter westerlies; otherwise private boats.