Scuba progression.

Open Water → cheap experience & advanced certs in SE Asia → the world's best dives, slotted into the van routes.

Where you are: Open Water certified, own dive computer, early dive count, no advanced or specialty certs yet. Perfect launch point — the plan is build confidence at home, accelerate cheap in SE Asia, then dive the planet on the trips.

Start here — first 4 moves, in order

Move 1 · now, anywhere

Do your Nitrox cert

Cheapest cert, biggest payoff — longer bottom time. Theory is often online-only.

½–1 day · do the theory from home

~$140–250

Move 2 · next 2 months

Buy your personal kit

Mask + snorkel, travel fins, 3mm wetsuit, DSMB + spool, torch, save-a-dive kit (computer ✅ already owned)

All carry-on-able · rent the bulky/expensive stuff for now

~$400–900 all-in

Move 3 · before Europe

Drysuit cert in cold AU water

Melbourne / Tasmania cold water = perfect practice. The gatekeeper for Silfra, Norway & cold-Med diving.

1–2 days / 2 dives

~$399

Move 4 · SE Asia trip

AOW → Rescue → specialties

Koh Tao or Gili — the cheapest cert factories on earth. Bank 30–50+ dives while you're at it.

~1–2 weeks

~$1,500–2,500 for the lot

Where I am now.

A solid, common starting point — certified and self-equipped on the safety basics. The gaps are all closeable cheaply in SE Asia.

Have

Open Water certification (PADI/SSI cross-recognised worldwide)
Own dive computer — the smartest first purchase, already done
Comfortable to ~18m on the OW ticket
A multi-year travel plan that passes near world-class diving on every route

Gaps to close

No Advanced Open Water — caps you at 18m and off most liveaboards
No Nitrox — the cheapest, highest-payoff cert
No Rescue/EFR — the cert that makes you genuinely safe
No drysuit skills — locks you out of the best cold dives (Silfra, Norway)
Low logged-dive count — needed before the advanced bucket-list sites
Minimal personal gear beyond the computer

Certifications — in order.

PADI and SSI are cross-recognised everywhere, so mix freely and just take whoever's cheapest/best at each spot. SE Asia (Koh Tao, Gili) is the cheapest place on earth to certify — do the bulk there.

Cert	What it unlocks	Time	AU cost	SE Asia cost	Best done
NitroxEnriched air	Longer bottom time, shorter surface intervals. Do first.	½–1 day	$140–250	$130–200	Now, anywhere
Advanced Open WaterAOW	Dive to 30m + navigation + deep. The single most useful step up; opens most liveaboards.	2 days / 5 dives	$350–460	$340–450	SE Asia
Rescue + EFRFirst aid / CPR	Self-rescue + assisting others. Makes you a genuinely competent, safe diver.	3–4 days	$595–695	~$770 bundled	SE Asia (after ~20–30 dives)
DeepSpecialty	To 40m (rec max) — deeper wrecks & walls.	2 days	$350–450	$250–350	SE Asia
WreckSpecialty	Penetrating wrecks (Liberty, Coron, Thistlegorm).	2 days	$350–450	$250–350	SE Asia (on a wreck)
DrysuitSpecialty	Essential for cold Europe — Silfra, Norway, winter Med. Can't dive Silfra without it.	1–2 days	$399	n/a (warm)	AU cold water
SidemountSpecialty	Twin side tanks — redundancy; caves/wrecks/tech path. Optional.	2 days	$400–500	$300–400	Optional
DivemasterFirst pro level	Guide certified divers, work around the world. Big commitment.	2–8 weeks	$2,500–4,000	~$1,650+ (cheapest on earth)	Only if going pro · SE Asia

Gear — buy vs rent.

As a travelling diver, every kg costs you. Own the personal-fit / hygiene / safety items; rent the bulky, expensive, service-hungry stuff until you're diving enough to justify hauling it. You already made the best first buy — the computer.

Item	Buy or rent?	Why	Cost (AUD)
Dive computer	✅ Own (done)	Logs dives, your settings, safety. Best first buy — nailed it.	owned
Mask + snorkel	✅ Buy first	Fit is personal; a leaky rental ruins dives. Tiny to pack.	$50–250
Fins (travel)	✅ Buy early	Comfort + efficiency; get compact spring-strap fins.	$80–400
Wetsuit (3mm)	✅ Buy	3mm = tropics; 5mm = SA/NSW winter; 7mm = Tas/Melbourne.	$150–600
DSMB + spool	✅ Buy early	Safety-critical surface marker; often required on liveaboards.	$60–160
Dive torch + save-a-dive kit	✅ Buy	Night/wreck use; O-rings, straps, defog save trips.	$80–230
Regulator + octopus	⚠️ Rent, buy later	Pricey, heavy, needs annual servicing (hard on the road). Buy at 30+ dives/yr.	$700–1,150+
BCD	⚠️ Rent, buy later	Bulkiest item to pack; buy a travel BCD once you know your style.	$500–1,150
Drysuit	⚠️ Rent until Europe	Bulky + needs cert; rent in Iceland/Norway, buy only if cold diving becomes regular.	rent / $1,500–4,000
Tanks + weights	❌ Always rent	Can't fly with them; every operator supplies them.	incl. / hire

Buy-now list (~$400–900, all carry-on-able): mask + snorkel, travel fins, 3mm wetsuit, DSMB + spool, torch, save-a-dive kit. With your computer that's a complete personal kit for every warm-water dive on this page.

Australia — build experience at home.

Rack up dives and tick a few uniquely-Australian encounters before you fly off. Cold-water sites double as drysuit practice for Europe.

Spot	Best season	Level	Type · ~cost	Highlight
Great Barrier ReefCairns / Port Douglas	Jun–Oct (dry)	OW	Day-boat · ~$250–350	Warm-water confidence builder; your first 10–20 dives.
Cod Hole & Ribbon ReefsQLD liveaboard	Jun–Oct	OW/AOW	Liveaboard · from ~$2,355 (3N)	Hand-feeding-distance potato cod, pristine ribbons.
Osprey ReefCoral Sea	Year-round	AOW + ~20 dives	Liveaboard · from ~$2,995 (4N)	Shark-feed dives, 1,000m walls, huge viz.
SS YongalaTownsville	May–Oct	AOW + buoyancy	Day-boat · ~$350–545	One of the world's best wrecks — sea snakes, giant groupers, eagle rays.
NingalooExmouth WA	Whale sharks Mar–Aug	Snorkel	Day-boat · ~$400–625	Swim alongside the world's biggest fish; mantas year-round.
Rapid BaySouth Australia	Year-round	OW (shore)	Shore · gear hire	The iconic leafy seadragon under the jetty.
WhyallaSouth Australia	May–Aug (peak Jun–Jul)	OW · cold 5–7mm	Shore/guided · ~$330	Tens of thousands of giant cuttlefish mating — world-unique.
Neptune IslandsPort Lincoln SA	May–Oct	No cert (cage)	Liveaboard · ~$1,500–3,300	Great white cage diving; world's only ocean-floor cage (Rodney Fox).
Julian RocksByron Bay NSW	Grey nurse May–Oct	OW	Day-boat · ~$150–280	Australia's most accessible temperate shark/biodiversity dive.
Fish Rock CaveSouth West Rocks NSW	Year-round (summer best)	AOW + experience	Day-boat · ~$260–980	Australia's only true ocean cave + biggest grey nurse population.
TasmaniaEaglehawk Neck	Dec–Mar	OW–AOW · cold	Shore/day-boat · gear hire	Temperate reefs, handfish — perfect drysuit practice before Europe.

SE Asia — cheap certs + world-class diving.

Your dive-skill accelerator (van Route 3 = SE Asia fly/stay). Do the bulk of your certs here, bank dives cheaply, then crown it with Raja Ampat or Tubbataha once you have the experience.

Spot	Best season	Level	Type · ~cost	Highlight
Koh TaoThailand	Mar–Sep	Courses	Shore/boat · OW ~$400–550	The world's #1 cheapest cert factory — certify + bank cheap dives.
Similan + Richelieu RockThailand (Andaman)	Oct–mid-May (park)	AOW	Liveaboard · ~$720–870 (3–4N)	Thailand's best site — whale sharks, mantas, purple soft coral.
Tulamben — USAT LibertyBali, Indonesia	Year-round	OW (shore!)	Shore · ~$40–90	A great WWII wreck 30m off the beach — ideal Wreck-cert spot.
Gili IslandsLombok, Indonesia	Year-round	Courses	Day-boat · cheap certs	The other great budget cert hub; turtles galore.
KomodoFlores, Indonesia	Apr–Nov (mantas vary)	AOW + experience	Liveaboard · ~$860–6,100	Manta trains, ripping drift dives, sharks; dragons topside.
Raja AmpatWest Papua, Indonesia	Oct–May	AOW + experience	Liveaboard · ~$3,600–8,600 (7N)	The most marine-biodiverse place on Earth. The SE Asia ceiling.
MalapascuaCebu, Philippines	Year-round (Mar–Jun best)	AOW	Day-boat · mid-range	The only reliable place on earth for pelagic thresher sharks.
TubbatahaSulu Sea, Philippines	mid-Mar–mid-Jun ONLY	AOW + experience	Liveaboard · ~$2,800–5,300	UNESCO crown jewel — ~360 coral species, sharks, walls.
CoronPalawan, Philippines	Mar–Jun	AOW + Wreck	Day-boat · mid-range	Best wreck diving in the Philippines — a Japanese WWII fleet.
MoalboalCebu, Philippines	Year-round (avoid Jun–Oct)	OW (shore)	Shore · ~$55–95	A permanent bait-ball of millions of sardines, 5m off the beach.
SipadanBorneo, Malaysia	Year-round (closed Nov 2026)	AOW + ~20 dives	Day-boat · permit ~$150/day	Barracuda Point tornadoes, turtles, the legendary drop-off. Book ahead.

World-class dives — sequenced to the van routes.

The bucket-list dives that fall near each van leg (see trips →). Drysuit unlocks the cold European ones, so do that cert early.

Dive	Best season	Level	Type · ~cost	Route
Red Sea — Thistlegorm + BrothersEgypt	Sep–Nov & Mar–May	AOW + Deep	Liveaboard · ~$2,300–3,700/wk	🚐 Routes 1 & 2 fly from Europe
Silfra fissureIceland	Year-round	Drysuit required	Shore · ~$430	🚐 Route 1 (Nordics) fly-out
Arctic orca & humpbackNorway	Oct–Jan	Drysuit · cold	Expedition · ~$5,500–8,300	🚐 Route 1 (Nordics)
Azores — blue sharks & mobulasPortugal	Jun–Oct	AOW +	Day-boat · ~$290–330/dive	🚐 Route 1 (Atlantic edge)
Malta & Gozo — Blue Hole + wrecksMalta	Mar–Nov	OW–AOW	Shore/boat · moderate	🚐 Route 1 (S Europe)
Medes IslandsSpain	May–Oct	OW–AOW	Day-boat · moderate	🚐 Route 1
Adriatic — caverns & wrecksCroatia / Greece	May–Oct	OW–AOW	Day-boat · moderate	🚐 Route 2 (Balkans) trip detail →
Florida — cenote/cave springsUSA	Year-round (~22°C)	OW (cavern)	Shore · ~$30–60/day	🚐 Route 5 (USA) trip detail →
Jupiter — goliath grouper + sharksFlorida, USA	Grouper Aug–Oct	AOW + experience	Day-boat · moderate	🚐 Route 5
Channel Islands kelp forestsCalifornia, USA	Jul–Oct	AOW · cold	Day-boat · moderate	🚐 Route 5 (West Coast)
Kona manta night diveHawaii, USA	Year-round	OW	Day-boat · ~$330	🚐 Route 5 (fly-out)
Yucatán cenotes + CozumelMexico	Year-round	OW (cavern)	Shore/boat · ~$170–300	🚐 Route 5 (into Mexico)
Socorro giant mantasMexico (Baja)	Nov–May	Advanced · blue-water	Liveaboard · ~$4,300–6,400/wk	🚐 Route 5 (Baja)
Galápagos — hammerheads & whale sharksEcuador	Whale sharks Jun–Nov	Advanced · 50+ dives	Liveaboard · ~$9,100–9,700/wk	🚐 Route 6 — the flagship trip detail →
Easter IslandChile	Dec–Mar	OW–AOW	Day-boat · premium	🚐 Route 6
Fernando de NoronhaBrazil	Aug–Jan	OW–AOW	Day-boat · premium	🚐 Route 6
Patagonia sea lionsArgentina	Sep–Apr	OW · cold	Day-boat · moderate	🚐 Route 6

Route 4 (Caucasus → Central Asia) is a no-dive leg — it's landlocked (only marginal cold Black/Caspian Sea options). Treat it as a climbing/overland chapter, or use it as a launchpad to fly to the Red Sea.

The standout shortlist.

Ten dives that define the journey — each tagged with its van route. The same shortlist appears on the trips page. Honest difficulty noted.

SS Thistlegorm + Brothers/Daedalus, Egypt — the world's best wreck + shark walls, at budget liveaboard prices. AOW + Deep, experienced.🚐 Routes 1 & 2~$2,300–3,700/wk
Silfra, Iceland — dive between two tectonic plates in 100m-viz glacial water. Drysuit required.🚐 Route 1~$430
Arctic orca & humpback, Norway — snorkel with whales in the polar winter. Cold, drysuit.🚐 Route 1~$5,500–8,300
Blue sharks & mobulas, Azores — open-ocean pelagics over seamounts. AOW+.🚐 Route 1~$290–330/dive
Yucatán cenotes, Mexico — flooded limestone caverns of light & stone. OW for cavern.🚐 Route 5~$215–300
Kona manta night dive, Hawaii — mantas barrel-roll through your lights. OW.🚐 Route 5~$330
Socorro giant mantas, Mexico (Baja) — oceanic mantas that seek you out. Advanced, blue-water.🚐 Route 5~$4,300–6,400/wk
Galápagos hammerheads & whale sharks, Ecuador — world top-3; schooling sharks at Darwin's Arch. Advanced — 50+ dives.🚐 Route 6~$9,100–9,700/wk
Easter Island, Chile — the clearest water on Earth + an underwater Moai. OW–AOW.🚐 Route 6
Raja Ampat, Indonesia — peak marine biodiversity on the planet. AOW + experience.🚐 Route 3~$3,600–8,600/wk

Australian honourable mentions (the home-build chapter)

SS Yongala wreck · Ningaloo whale sharks · Whyalla cuttlefish aggregation · Neptune Islands great whites.

Cost & sequence.

Roughly what each chapter costs. The certs are cheap; the liveaboards are where the money goes — time those to the routes.

Personal gear

$400–900

Carry-on kit · one-off

SE Asia accelerator

$1.5–2.5K

AOW + Rescue + specialties + dives

Drysuit cert (AU)

~$399

Unlocks cold-Europe diving

A bucket-list liveaboard

$2.3–9.7K

Red Sea → Galápagos · per trip

The progression, in one line each

Now (Australia): Nitrox + personal kit + build dives on the GBR/Byron; do the Drysuit cert in cold Melbourne/Tas water; tick a leafy seadragon or grey nurse.
SE Asia (Route 3 fly/stay): AOW → Rescue + EFR → Deep/Wreck/Night for a fraction of AU prices; bank 30–50+ dives; build to Komodo/Sipadan/Malapascua, crown with Raja Ampat or Tubbataha.
On the routes: Med wrecks + Red Sea + Silfra + Norway (Routes 1/2) → Florida, California, Hawaii, Mexico, Socorro (Route 5) → Galápagos & South America (Route 6).