Yena Wall is the least-known of the Kurnell shore dives, reached from Yena Flat – a rough, primitive parking area off the park road south-east of The Leap – and it rewards the effort with a wall quite different in character from its neighbours. The entry bay is shallow, about five metres over large boulders, but beyond it a wall of whitish-pink rock drops to 15 m, with kelp and a little sand at its foot. Followed north-east and then east the wall holds 15–18 m for a good twenty minutes, with small overhangs and boulders along its northern section, and a large cave opens at 14 m south-east of the main face; from there the reef shallows gradually westward to 8 m and then the 5 m boulders of the exit.

Fish life is solid rather than spectacular: one-spot pullers and ladder-finned pomfrets in clouds, yellowtail, Port Jackson sharks and a horned shark under the ledges, and eastern blue devilfish in the cave and cracks. An odd feature is the bottom itself, which is covered in what McFadyen estimates as millions of discarded fishing sinkers from the rock platform above. The difficulty is entirely the surface: the site is at the very entrance to Botany Bay, takes swell from any direction, and the exit is a sloping rock on the southern side of the bay that is only usable in a flat sea, so it is a dive for a run of westerly winds and for a buddy pair that includes someone good at reading entries, exits and compass courses.

McFadyen rates it intermediate to advanced for that reason. It is the natural next step for divers who know The Leap and want something quieter, and it links underwater to the boat-dived Yena Gap Outer Reef and Anchor Reef just to the south.

Drive into Kamay Botany Bay National Park at Kurnell and continue past the Inscription Point and Leap car parks; a very rough track on the left leads to Yena Flat, a primitive unsealed parking area (take care in a low car). Walk 100–150 m down to the small bay, gear up on the rocks and enter from the rock platform on the bay's northern side. Exit via the sloping rock on the southern side.

Go with someone who knows the entry and exit and is good at navigation; the exit needs really calm seas.

Sits right at the mouth of Botany Bay on the Kurnell headland and is exposed to every swell that enters – you need really calm seas to get back out of the water here. Plan it for a period of westerly winds when the ocean is flat; any north-easterly or easterly swell makes the sloping-rock exit dangerous, and southerly swell wraps the headland. Tidal current at the entrance can be felt along the deeper wall; an incoming tide gives the best visibility.

The bottom is carpeted in lost fishing sinkers from the platform above, a hint of how many lines are in the water on weekends.

Swim north-east 10 m and descend onto the 5 m boulders, follow the wall as it drops to 15 m north-east then east for about 20 minutes, ascend slightly and follow the shallower wall south-east then south past the large cave at 14 m, and continue west into the 5 m zone towards the exit on the southern side of the bay. A straight out-and-back along the wall is the simpler alternative.

No operator; experienced independents and St George Scuba Club on flat westerly days.