Don't Pee in the Dry Suit: 5 Tips for Diving Cold Water and Loving It

Cold water diving is fantastic. Most people don't realize it, but -- apart from coral reefs -- the cold water regions are by far the most productive underwater ecosystems on the planet. As the water temperature drops, the strange and beautiful sights increase.

Unfortunately, cold water diving has one disadvantage; we're warm-blooded mammals, and we like our bodies to stay that way. Keeping warm in a cold water dive is the most intimidating aspect to doing one, but if you ask anyone who's tried, it's a lot easier than it seems. Here are a few tips for making your ventures into the icy deep enjoyable.

1) Use a Drysuit


Drysuits are great. Even if they're more complicated to use, with a drysuit there's no ice cold finger creeping down your neck when you jump in. Also, throughout your dive, you stay a lot warmer and spend a lot less energy (and air!) keeping warm. That means it's possible to stay below the surface for a longer period of time, and with a lower risk of hypothermia.

Getting in the water with a drysuit is more like being outdoors on a bitter-cold day with a good warm jacket on than jumping in the water. Sure, your hands, feet, and head are still exposed but the drysuit makes a world of difference.

Diver Under Ice

There are some technical challenges, however. If you've never used a drysuit, you'll want to take a class. All of a sudden you have a third air volume to manage for buoyancy control, besides your lungs and BC. On the other hand, if you're planning more than one dive a day, the drysuit will soon be indispensable.


2) If You're Diving with a Wetsuit, Do It Right


It's possible to dive in even quite cold (5C) water with a thick enough (7mm) wetsuit. Some people even wear polyester underwear under their wetsuit, but it's not clear how well this can work.

As the temperature drops, extremity protection (excellent boots -- high sided if you can find them -- and three finger gloves) become really important. Priming helps too.

If you dive IN cold water in a wet suit, prime the suit before you jump in. Keep a few liters of warm to hot water in an insulated container. Before you get in the cold water, pour the warm water down the front of your wetsuit until it starts leaking out the ankles. Do the same for boots and gloves.

Divers under ice

That way, your body won't have to work to warm up the layer of water trapped beneath the skin and the wetsuit. Some recommend wearing latex surgical gloves under your wetsuit gloves, which keeps the skin dry and reduces heat loss if the water trapped in your gloves starts mixing with the sea.

When you get out of the water, use that hot water to thaw zippers, regulators, or your face and frozen fingers. Just be careful with your fingers. The best way to avoid problems is thawing your hands by squeezing them under your armpits.


3) Stay Warm Out of the Water


The most important thing is to stay warm before going in the water and get warm immediately after getting out, if you can. If you spend 15 minutes in cold wind, that's five minutes less time you can spend under water.

Keep a jacket around to put on or take off when you get in and out of the water. A warm, moisture-wicking hat does wonders for keeping you warm until you add your hood, and as long as it can still insulate when wet, it's great for wearing once you're back on the surface too. If you're going to be walking around in your socks, keep some plastic slippers at the ready.


4) Eat, Drink, and Be Merry


Just as being a little flabby turns out to be welcomed insulation in cold water, a solid breakfast gives your body fuel it can consume to generate much-needed extra heat. 

A cup of warm beverage before you jump in won't harm your core temperature either, and a cup of hot whatever after you get out will feel downright fantastic. Keep some carb-y snacks around for when you get out to make up all the calories your body burned keeping itself warm.


5) Be Organized


Cold water diving means even more gear than warm water diving. For dive boats, having plenty of bins and mesh bags to keep your stuff organized will go a long way to helping your sanity, and protecting your gear from the elements. You can also fill them with water to rinse off and soak gear that's wet. For temporary storage, you can keep some garbage bags close at hand so that your BC, wetsuit, and fins don't soak everything else in your dive bags.


Further Reading



Photography Courtesy of, Saeed Rashid, Icy_Sea_Slugs, and David O.


Published Mar. 20,














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