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Scuba diving guides

Articles on dive skills, certification, dive planning and dive sites.

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Scuba GearNovember 1, 20269 min read

Scuba Diving With Glasses or Contacts: Masks, Lenses and Readers

Glasses don't fit under a dive mask. Compare drop-in and bonded prescription lenses, gauge readers, soft and rigid contacts, and diving after LASIK or PRK.

Dive Computers & DecompressionNovember 1, 202610 min read

Dive Tables Explained: PADI RDP, US Navy, DECO 2000 and BSAC 88

What a dive table is, how to read one step by step, and how the PADI RDP, US Navy, DECO 2000, BSAC 88 and NAUI tables compare on air at 18 m (60 ft).

Safety & Dive MedicineOctober 31, 20268 min read

Mini Scuba Tanks: Are They Safe and How Long Does One Last?

A 0.5 L mini scuba tank holds about 99 L of air, 2 minutes at 10 m. Lung injury risk in shallow water, recalled kits, air quality and who should use one.

Dive Computers & DecompressionOctober 31, 20269 min read

Trimix vs Heliox: What Is the Difference and Who Uses Each

Trimix vs heliox: what each gas contains, why tech divers keep some nitrogen, why saturation divers breathe heliox, and END and ppO2 worked out at 60 m.

Scuba GearOctober 30, 20268 min read

How Much Air Is in a Scuba Tank? Litres, Cubic Feet, Bar and PSI

A 12 L scuba tank at 200 bar holds about 2,370 L of air and an AL80 about 2,192 L. Common tanks in bar, psi, litres and cu ft, with worked conversions.

Training & CertificationOctober 30, 20269 min read

Does Scuba Certification Expire? What Lapses and How to Replace a Card

PADI, SSI and BSAC diver cards never expire. Pro ratings, first aid training and medical clearance can lapse. Dive centre gap rules and lost card replacement.

Dive DestinationsOctober 29, 202610 min read

Where to Dive in December: 12 Scuba Destinations by Region

Where to dive in December: 12 scuba destinations with water temperature, wetsuit and main risk for each, plus the Red Sea in winter and the places to skip.

Scuba GearOctober 29, 20268 min read

How Much Does Scuba Gear Weigh? Item by Item, Tank and Travel

Scuba gear weight item by item from spec sheets: mask, fins, wetsuit, BCD, regulator, computer, tank and lead, plus what a dive bag weighs for a flight.

Dive Computers & DecompressionOctober 28, 20267 min read

Apple Watch Ultra Dive Log: Where Dives Go and How to Export Them

Where the Depth app and Oceanic+ save Apple Watch Ultra dives, what each log records, how to export dives as UDDF files and how to get a watch dive signed.

Dive DestinationsOctober 28, 202610 min read

Where to Dive in November: 12 Destinations, Water Temps and Risks

Where to scuba dive in November: 12 destinations with water temperature, suit and main risk, where to find mantas and reef sharks, and what to avoid.