Lynnie's Bommie is a named coral bommie close to Middle Beach on the north coast. It appears in Curious Campers' account of diving the island alongside Middle Beach, and it is commonly dived as part of a Middle Beach dive rather than as a site in its own right. The name, like Leanne's Leap to the west, honours a local diver – many of Christmas Island's sites were named informally by the dive guides who first explored them.

Documentation of the bommie itself is minimal. Bommies on this coast rise from the sand and rubble at the base of the reef slope and act as magnets for fish: expect schooling fusiliers and anthias around the top, butterflyfish, angelfish, hawkfish and groupers in the crevices, moray eels in holes and sea fans on the shaded faces. Turtles rest on or near bommies, and the sand around the base can hold garden eels, rays and gobies. Whale sharks and mantas pass along the north coast in the wet season.

As a compact structure with good light it is attractive to photographers, and because it is shallow and close to a sheltered reef, it suits divers of all levels. The bommie is in the lee of the island through the south-east trade season (roughly April to November) and exposed to north-west monsoon swell from December.

Treat this as a lesser-known, lightly documented site: the operator's briefing will give the actual depths and layout. Its inclusion here records a named site that visiting divers may see on a dive-shop whiteboard, and it is worth asking for if you enjoy bommie dives such as Million Dollar Bommie.

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 Middle Beach, where the bommie lies off the reef.

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 onto the bommie, circle it slowly from base to top looking into crevices, then move onto the adjacent Middle Beach reef for the rest of the dive, finishing at 5 m.

Extra Divers Christmas Island and CI Wet'n'Dry Adventures – occasional, usually combined with Middle Beach.