Enterprise is a single large bommie sitting right on the edge of the drop-off, and its position is everything. According to the official Cocos tourism listing, the incoming tide causes an upwelling at the bommie that sets off 'the food chain', and a dive here on the right tide is one of the most action-packed on the islands. The published range is 15–35 m.

Nutrient-rich water pushed up the wall concentrates small fish around the bommie; schools of paddletail snapper hang in the flow, and the predators follow. Grey reef sharks cruise in close along the drop-off, dogtooth tuna make fast passes out of the blue, and large groupers sit around the base of the bommie. The bommie itself is covered in hard and soft coral with the usual Cocos reef fish, but most divers find themselves looking outward rather than at the coral.

The dive is run around the tide: Cocos Dive aims to put divers in on the incoming flow, when the upwelling and the fish are at their best. That also means some current, and while the dive is manageable for Open Water divers under guidance, it suits Advanced divers comfortable at 20–30 m, since the deepest action is on the drop-off side. The site lies west of Direction Island on the northern side of the atoll, in the same area as Two Caves, Cannons, Two Ridges and Fan Wall, and Enterprise is commonly the first dive of a day that ends at Direction Island for lunch.

The origin of the name is not documented publicly. For photographers, a wide-angle lens is the choice; sharks and tuna do not come close for long, and the best images are of the bommie with schooling paddletails and a shark passing behind. With visibility typically 25 m or better on the incoming tide, the drop-off side gives an exceptional sense of space.

Fly to West Island on the twice-weekly Virgin Australia service from Perth (usually routed via Christmas Island; allow 7–10 days on the islands to absorb weather and flight delays). Cocos Dive collects divers from West Island accommodation in the morning (pickup around 8 am, departure about 9 am) and runs its boats from West Island into the lagoon. These sites lie along the northern rim of the atoll near Direction Island, at the north-eastern side of the lagoon around Port Refuge.

The boat crosses the lagoon from West Island to reach them, and they are conveniently paired with the lunchtime surface interval on the beach at Direction Island (eco toilets and shelters, no shops). Live-boat drops or moorings; no shore access.

Cocos has two seasons. The south-east trades blow steadily from roughly April/May to October, often 15–25 knots, which chops up the lagoon and pushes swell onto the eastern and southern outer reefs; divers are then kept to sheltered sites. The doldrum season (November to March/April) brings lighter, variable winds, flatter seas and the widest choice of outer-reef sites, and is the best time to dive, though it is also the tropical cyclone season and squalls pass through.

The northern-rim sites near Direction Island catch tidal flow through the passage at Port Refuge; the incoming tide brings clear ocean water and upwelling along the drop-off, the outgoing tide carries lagoon water out and lowers visibility. In strong south-east trades the lagoon crossing is choppy and wet but these sites are partly protected by the atoll; big northerly swell, uncommon, closes them. Enterprise is best on the incoming tide, when the upwelling concentrates fish on the bommie.

Descend to the top of the bommie at around 15 m, then work around the drop-off side at 20–25 m where the upwelling hits. Settle on the edge and watch the blue for grey reef sharks and dogtooth tuna, then circle back to the shallower side and ascend up the bommie for the safety stop.

Cocos Dive (Dieter Gerhard, West Island, operating since 1990) is the only scuba operator on the islands and the only way to dive this site. It runs seasonal two-dive day trips with lunch and a surface interval on Direction Island, maximum 10 divers per trip; sites are chosen on the day according to wind, tide and diver experience. Trips book out well ahead and courses are currently suspended, so arrive certified.