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Scuba diving guides

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

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Dive Computers & DecompressionSeptember 28, 202611 min read

How to Plan a Decompression Dive: Stops, Gases, Gradient Factors

What a decompression plan is built from, what each gradient factor changes, where deco gas switches happen, and the stop schedules for one 40 m dive.

Scuba GearSeptember 28, 202611 min read

Drysuit Diving Basics: How It Works, Training and Weight

How a drysuit keeps you warm, what the two valves do, the agency course requirements, the feet-first ascent, extra lead, care and what it costs to start.

Scuba GearSeptember 25, 202610 min read

Underwater Photography Basics: Why Your Photos Are Blue and Hazy

Why underwater photos turn blue and hazy, how close you have to get, where to put the light to stop backscatter, when red filters work, and the settings that matter.

Training & CertificationSeptember 25, 202611 min read

Night Diving Basics: Lights, Signals and Staying Together

What changes after dark: primary and backup lights, torch signals, buddy distance, how the exit gets marked, night navigation and why air use goes up.

Dive Computers & DecompressionSeptember 25, 202610 min read

How Nitrox Is Blended: Partial Pressure, Sticks and Membranes

How dive shops make nitrox: partial pressure blending, stick blending, membranes and pre-mixed banks, with worked fills in bar and the oxygen cleaning rules.

Dive DestinationsSeptember 24, 202612 min read

Diving in Madeira: Dive Sites, Garajau Reserve and Seasons

Diving in Madeira by site and month: the Garajau reserve and its groupers, the Funchal and Porto Santo wrecks, Desertas rules, sea temperature and fees.

Scuba GearSeptember 24, 202612 min read

Scuba Tank Size Chart: Aluminum vs Steel Tank Weight and Buoyancy

Scuba tank size chart for aluminum and steel: AL80, AL100, HP100, HP120, LP85, 12 and 15 L, with weight in kg and lb, dimensions and buoyancy full and empty.

Dive Computers & DecompressionSeptember 23, 202611 min read

Why Divers Use Helium in Trimix: END and Choosing a Mix

Why helium replaces nitrogen at depth, how equivalent narcotic depth is calculated two different ways, and how to pick a trimix mix with worked numbers.

Dive DestinationsSeptember 23, 202611 min read

Nusa Penida Diving: Manta and Mola Season, Sites and Currents

Nusa Penida diving by site and season: depths and currents at Manta Point and Crystal Bay, manta and mola months, water temperature and the MPA rules.

Training & CertificationSeptember 22, 202610 min read

How to Get Into Technical Diving: Courses, Prerequisites and Costs

What makes a dive technical, entry rules at PADI, SSI, TDI, GUE and CMAS, the order to train in, the gear that changes, course prices and the risk data.