Silfra is a snorkel for almost everyone and a dive for a few
Snorkelling vs diving in the Silfra fissure at Þingvellir — certification, the 2°C water, the drysuit, and what you actually see in each.
Silfra is a crack in the earth at Þingvellir where the North American and Eurasian plates are pulling apart. Glacier meltwater from Langjökull filters through lava for decades before it seeps into the fissure, so it arrives at around 2 to 4°C and clear to roughly 100 metres. You float through it in a drysuit. It is one of the few things in Iceland that lives up to its photos.
The question is whether to snorkel or dive. For most people it’s not a close call.
Snorkelling — what it actually is
You lie face down on the surface in a drysuit with a thick undersuit, hood and gloves, and the current carries you slowly down the fissure for 30 to 40 minutes. You barely swim. The suit is buoyant, so you can’t go under even if you try. Below you the walls drop away into blue, and the visibility means you see the bottom 20 metres down as clearly as your own hands. Your face and hands get cold. Everything else stays dry.
The requirements are real but not demanding. You must be able to swim and be comfortable in water. Arctic Adventures sets a minimum age and minimum height and weight for the drysuit sizes, so read those before booking a child or a small adult. Pregnant women can’t do it. Otherwise, if you can walk 200 metres over lava in a suit, you can snorkel Silfra.
Two ways to book. If you’re driving the Golden Circle yourself, Into the Blue — Silfra Snorkelling (from €118, three hours) meets you at the Þingvellir car park. If you’re based in Reykjavík without a car, the same tour with pickup is from €182 and five and a half hours door to door. The €64 difference is the transfer. Nothing else changes.
Diving — the certification wall
The Silfra dive (from €248, four hours) takes you down to about 18 metres through the same fissure and into the wider lagoon at the end. You get the walls above you as well as below, and the light coming down from the surface is the thing divers talk about afterwards.
But the Þingvellir national park rules, not the operator, require every diver to hold a drysuit certification, or to show logged drysuit dives within the last two years, on top of an open-water certificate. No exceptions on the day. If you’re an open-water diver without drysuit experience, the only route in is Arctic Adventures’ two-day PADI Dry Suit course with Silfra dive (from €639), which certifies you on day one and dives Silfra on day two. That’s a serious commitment of both days and money for one dive site.
Diving is also colder for longer, the gear is heavier, and a first drysuit dive in 2°C water with a dry mouth and a regulator is not relaxing. Experienced cold-water divers love Silfra. Warm-water divers often come out saying they’d have been happier on the surface.
What you see in each
Honestly, similar. The fissure is narrow enough and the water clear enough that the snorkeller sees most of what the diver sees, from a different angle. There is very little life. Some bright green algae the guides call troll hair, the occasional small fish. You are not there for wildlife. You’re there for the geology and the clarity, and both are visible from the top.
Our honest take
Snorkel. Book 208 if you have a car and are doing the Golden Circle anyway, 17145 if you don’t. Add it to a Þingvellir morning and you’ve turned the least dramatic stop on the Golden Circle into the best one.
Dive only if you already hold a drysuit certification and cold water doesn’t bother you. If you’d need the course, spend the €639 and two days on something else in Iceland and keep Silfra as a snorkel. You won’t feel short-changed.
One more thing. It’s cold. Your face will hurt for the first two minutes and then you’ll stop noticing. Everyone says that, and everyone is right.
