No-Name Rock appears in Divernet's account of diving Lord Howe as a landmark: Rupert's Reef sits in the channel between No-Name Rock and Roach Island in the Admiralty Islets. It is listed here as its own entry because it is a named feature on the local dive map and the reef around it is part of the same system divers explore from Rupert's Reef, but it is not documented as a stand-alone dive in any source found.

What can be said is what the surrounding sites show. The channel between the islets concentrates fish and brings in current from the Coral Sea, which is why Rupert's Reef supports such a dense mix of species – a resident green turtle, painted crayfish, squat lobsters, grey coral gobies, saddled rock cod, splendid hawkfish, Lord Howe butterflyfish, doubleheader wrasse and McCulloch's anemonefish. The rock faces in the Admiralty group carry hard corals, gorgonian fans, bryozoans and small sea fans, and Galapagos sharks, kingfish and trevally are the common larger fish.

Divers visiting Rupert's Reef on a calm day with little current may be able to extend the dive towards No-Name Rock; ask the guide. Conditions are those of the Admiralty Islets generally – sheltered in southerly winds, exposed to north-east swell and north winds, and sometimes subject to current through the channels.

Depth, position and the character of the dive should be confirmed with Dive Lord Howe before relying on it, and the data confidence is low.

Lord Howe is reached only by air: QantasLink flies from Sydney daily (about 1 h 50 min), with Brisbane and seasonal Port Macquarie services. Accommodation must be booked before flights (visitor numbers are capped at about 400) and the checked-baggage limit is 14 kg, so most divers hire gear on the island. Dive Lord Howe's shop is at 2 Lagoon Road beside the Lagoon Beach boatsheds; most lodges transfer divers or it is a short bike ride.

Divers board the boat, which is moored in the lagoon, and exit the lagoon through North Passage, then run north-east around North Head to the Admiralty Islets, a group of seven rocky islets a few hundred metres to about 1.5 km off the island's north-east tip. The trip takes about 20 minutes. The boat anchors on sand or a small reef close to the site or runs live if there is current.

Lord Howe sits in the path of the prevailing south-east to east trades and winter westerly fronts. The Admiralty Islets are exposed to north-east and easterly swell and to northerly winds, which blow them out; they come into their own in south-westerly to southerly winds, when the island shelters them and the southern and western sites are rough. A 1.5 m swell from the north-east makes the shallower gutters surgy, and a lump above about 2 m stops the trip.

The Coral Sea current washes these islets more than other sites, so currents can pick up, especially on the outer edges. Visibility is typically 30–40 m. Best months are February–May; winter westerlies are fine here if the swell is down.

Normally dived in combination with Rupert's Reef: descend on the pinnacle in the channel and extend the dive towards No-Name Rock if the current allows, returning to the line for the ascent.

Dive Lord Howe (PADI 5-star, 2 Lagoon Road) – morning double boat dives daily in season, afternoon single dives on demand; site chosen on the day by wind and swell. Howea Divers has also advertised dives here.