Why dive in cold water?
Argentina offers some of the most spectacular diving experiences in the world precisely because of the cold. Cold water generates a higher concentration of dissolved oxygen, which favors the development of kelp forests, a large amount of benthic life, and close encounters with curious marine fauna (sea lions, whales, etc.).
Recommended Gear
Exposure Suit
| Water Temperature | Recommendation | Alternative |
|---|---|---|
| 10–14°C (50–57°F) | 7mm Semi-dry + hood | Drysuit |
| 6–10°C (43–50°F) | Drysuit + undergarment | Double 7-8mm Semi-dry |
| 4–6°C (39–43°F) | Drysuit mandatory | — |
Weights
You will need more weight than in tropical waters. Rule of thumb:
- 7mm Semi-dry → +4 to +6 kg compared to your 3mm weighting
- Drysuit → +2 to +4 additional kg (depending on the undergarment)
Essential Accessories
- 5-7mm gloves
- Neoprene boots
- Hood (if using a semi-dry suit)
- Dive light (cold waters usually have less ambient light)
- Dive knife or line cutter (in case of entanglement with kelp)
Specific Techniques
Water Entry
- In many Patagonian sites, entry is from the beach with surf. Use the “ducks dive” technique or enter with a buddy.
- Avoid getting your face wet prematurely (the cold can cause shock).
Buoyancy
Neoprene compresses more at depth. Control your buoyancy carefully, especially between 5 and 15 meters (15–50 ft).
Air Consumption
In cold water, air consumption is generally higher (thermal stress + thicker suit). Plan your dives with 30% more air than in temperate conditions.
Safety
- Never dive alone in cold water.
- Always have an emergency plan for hypothermia.
- Wear the appropriate suit. Saying “I don’t get cold” is the fastest way to get into trouble.
- After the dive, dry off and dress warmly quickly. The Patagonian wind drops your body temperature fast.
Practical Tips
- Bring thermal clothing for after the dive.
- Stay hydrated (the cold is deceiving and causes dehydration).
- Eat something warm between dives.
- At sites with kelp, always carry a line cutter.
Note: This guide compiles general technical recommendations for cold water diving. For specific medical advice, consult a hyperbaric doctor or the safety section of DAN (Divers Alert Network).