Silfra Fissure Snorkeling and Raufarhólshellir Lava Tunnel Combo — Snorkel Between Continents

You step off the bus into an Icelandic morning that feels both precise and raw: wind straight from the rift, air that bites and clears your head. The day begins underground at Raufarhólshellir, where a passage of cooled lava stretches for roughly 1.3 kilometers and the cave walls keep a record of fire — bulbous flows, banded colors, and columns like fossilized waves. Headlamps pick out textures and mineral stains; the ceiling hums faintly with the memory of molten rock. Later, after an early lunch and the short drive to Þingvellir, you suit into a drysuit and slip into Silfra’s glass-clear water, floating in a corridor of light that threads between two continents.