Best diving on the Great Barrier Reef

The best diving on the Great Barrier Reef depends on the format you pick, and the rest of the planning follows from that choice. A day boat leaves from Cairns in the morning and returns the same day, while a liveaboard sleeps on the water for several nights. The Reef Authority describes diving and fishing charters as the option for people who like to be in amongst the environment,⁴ and it separately lists long range roving tours, whose groups are small and whose trips can cover long distances.⁵

A Great Barrier Reef scuba diving tour by day boat suits first-timers and short stays. One all-inclusive day trip lists a single scuba dive, either certified or a 20-minute resort dive, plus unlimited snorkelling, with 1.5 hours by catamaran each way and breakfast, a BBQ lunch and a cheese-and-crackers stop included. A superyacht day lists 2 hours at Saxon Reef and 2 hours at Hastings Reef, with snorkelling and scuba diving offered at both. A coral cay cruise lists certified and introductory dives as optional extras at Upolu Reef.

A liveaboard suits certified divers who want volume. The 3-day, 2-night liveaboard trip lists up to 11 dives, 9 by day and 2 at night, across 19 dive sites at 4 outer reef locations, with a maximum of 32 passengers. Mike Ball runs standard expeditions of 3, 4, 5 and 7 nights from Cairns.⁶ With a single day to spare, a day boat is the realistic choice; with several days, a liveaboard changes which reefs you can reach.

Cairns scuba diving on a day boat spans a wide range of formats, and they differ in how much diving they leave room for. A 35-metre superyacht day lists scuba diving at Saxon and Hastings reefs, with a minimum age of 12 for introductory diving, medical clearance for divers over 65 and no diving within 24 hours before a flight. Down Under Cruise and Dive runs the 35-metre Evolution, with up to 5 hours on the reef at 2 outer reef sites.¹⁴

The Silverswift catamaran day lists 3 reef sites from Flynn, Pellowe, Milln and Thetford reefs, with a guided snorkel tour included and scuba diving offered. A premium catamaran day like this site's lists snorkelling and scuba diving at both reef stops, and certified divers must show proof of certification. Check which of the dives on your booking are extras, since several listings treat the dive as an optional add-on to a snorkel price.

Learning to dive on the Reef is possible without sleeping aboard. Sunlover is an SSI Training Centre. Its course spreads 9 training dives over 3 days, with 5 confined-water dives in a sheltered area under the Moore Reef pontoon and 4 open-water dives out on the reef itself.¹³ Pro Dive Cairns pairs a five-day Learn to Dive Open Water course alongside its three-day liveaboard trip.¹⁵

Every listing in this group asks for medical honesty. This site's own listing needs a medical questionnaire for diving, a minimum age of 12 with parental consent, proof of certification from certified divers and a moderate level of fitness. A day trip that includes a dive lists a minimum age of 12 for introductory diving, medical clearance from a physician for divers over 65, and no diving within 24 hours before a flight.

The Great Barrier Reef liveaboard trip asks certified divers to show proof of PADI Open Water certification or equivalent. The 2-day sailing trip on a 16-metre yacht books snorkelling only in its listed price, lists the minimum age for scuba diving as 12, and takes diving packages payable on board. Read what your booking covers, because a snorkel price and a dive price are not always the same line.

Pro Dive Cairns is a PADI dive centre in the Cairns CBD with purpose-built heated dive pools,²⁵ and its liveaboard carries a maximum of 32 passengers.²⁶ Mike Ball's Spoilsport follows an open dive deck policy with no limits on bottom time for safe diving.²⁷ Each operator sets its own dive procedures, so ask before you book rather than assuming one operator's rules apply to another.