Private Silfra Snorkeling & Leidarendi Lava Tunnel - with underwater photos

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Nicholas S.

August 25, 2025

⚠️ WARNING: This cave is disorienting and potentially deadly if you’re solo and unprepared. The wall map is useless — no “You Are Here,” no entrance location, and many of the tunnels and forks I encountered weren’t even shown. You can easily walk past a fork without noticing it if it opens up behind you as you move forward. If you’re going in solo, do this: • Bring a proper headlamp (minimum 500–1000 lumens) so you can keep both hands free. Bring backup batteries and a secondary light source (phone at minimum). • Wear a helmet — I hit my head once on a jagged ceiling and cut my scalp open through a baseball cap. • Wear boots with ankle support — footing is uneven and sharp. • Wear long sleeves and pants — you’ll be crawling in some spots. • Chem lights or physical breadcrumbs are smart to mark your route. Enter the left-side portal. I never explored the right, so I can’t speak to it. Once inside, you’ll eventually reach a room with some signs mounted to the wall. Before you proceed, turn around and look closely at the way you entered — there are two different tunnels leading into that space. If you don’t catch that detail, you might exit through a different tunnel without realizing it. That’s exactly what happened to me. I had gone past the signs deeper into the cave, maybe 10–15 minutes, until I started seeing a lot of particulates in the air. That made me uneasy — no airflow, no real reason for floating dust — so I turned around. I passed the signs again and continued, confident I was heading out. But I had unknowingly taken the wrong tunnel back. What followed were tighter, unfamiliar spaces, dead ends, and growing disorientation. I kept assuming I was on the right path until I hit a bizarre ceiling filled with lavacicles — a shark-tooth-like lava formation I knew I hadn’t seen before. That’s when I realized I was completely turned around. From there I tried different forks — all dead ends. I hit my head once while crawling out of a tight spot, cutting my scalp. I started thinking ahead: I had a powerful light with plenty of battery, but it’s finite. Maybe 1.5 hours on high, 3.5 on medium. My phone was 70–80%, so I had more light if needed. But if I couldn’t get out, I might be stuck overnight until someone finds me. That’s when it got serious. Eventually, I backtracked to the lavacicle ceiling, then to the sign room, and this time spotted the tunnel I had originally entered through. That’s what finally got me out. This was my first cave experience. It was thrilling and beautiful — but I made mistakes, and I could’ve paid for them. Don’t let your curiosity exceed your preparation. This cave doesn’t forgive that

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Eve N.

March 27, 2025

Beautiful. I only entered within 10 or so feet as I didn't have a helmet or a strong flashlight so definitely have those next time! 10/10 I recommend it! Gorgeous!

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Kevin N.

October 22, 2024

Neat tunnels you can explore without a guide. Bring your own headlamps! Definitely not accessible to folks with mobility disabilities.