Middle Beach is a north coast site listed by the Christmas Island Tourism Association and by Wet'n'Dry Adventures among their regular dives, and mentioned by Curious Campers together with the nearby Lynnie's Bommie. It takes its name from one of the small coral-sand beaches tucked into the base of the cliffs along the north coast, which are only reachable by boat or by difficult walking tracks.

Detailed published descriptions are scarce, but operators use it as a relaxed reef dive. The reef below the beach slopes from the shallows into a drop-off, with plate and branching Acropora, boulder corals and scattered bommies on the shelf. Reef fish are abundant: butterflyfish, angelfish, surgeonfish, triggerfish, wrasse and parrotfish on the reef top, with fusiliers, trevally, reef sharks and turtles along the edge. The adjacent Lynnie's Bommie adds a coral pinnacle to the route, and the sandy patches in front of small north-coast beaches often hold garden eels and rays.

The site's value lies in its flexibility. It is shallow enough for a relaxed second dive or for less experienced divers, yet the drop-off is within reach for those who want depth, and because it sits in the lee of the island through the south-east trade season it is usually calm from April to November. Like the rest of the north coast it is exposed to monsoon swell from December onwards.

Middle Beach suits beginners and intermediate divers, photographers and anyone who wants an unhurried dive with lots of fish. Operators decide the exact route on the day, so the briefing is the best guide to what you will see.

Fly from Perth (about 4 hours, two to three flights a week, some via Cocos Islands) and hire a car – there is no public transport. Both dive centres are in The Settlement and launch their boats from the jetty/boat ramp at Flying Fish Cove, normally at about 8 am for a two-dive morning trip. From the cove the boat runs west from the cove past Smith Point and then south-west along the north coast along the coast for roughly 12–15 minutes to the beach.

There is no land access to the dive, and the vertical sea cliffs mean no exit other than the boat. Operators choose sites on the morning according to swell and wind.

On the north coast, which is in the lee of the south-east trade winds from roughly April/May to November – that is the calm, reliable season here with glassy seas and 30 m+ visibility. From about December to March/April the north-west monsoon brings northerly and north-westerly swell (and occasional cyclone-generated swell) that can make the north coast undiveable and the Flying Fish Cove ramp unusable for days; Extra Divers treat February–April as peak swell season when trips are often cancelled. Any swell over about 1.5 m from the north-west quarter usually cancels the site.

Visibility dips after heavy rain run-off from the plateau and during red crab spawning (Oct–Jan) when plankton blooms. Tides are small (about 1 m) and rarely matter, but currents along the coast can pick up without warning.

Descend off the beach onto the reef slope, head along the reef with the drop-off on one side at 12–20 m, visit Lynnie's Bommie if the guide includes it, and return along the shallower reef to finish at 5 m.

CI Wet'n'Dry Adventures – lists Middle Beach among its regular sites; Extra Divers Christmas Island – occasional. Also listed by the Christmas Island Tourism Association.