Under an hour from Reykjavik, the Silfra fissure divides the Eurasian and American tectonic plates. Gin-clear waters, with visibility of up to 330 feet (100 meters), draw scuba junkies from around the globe. Fit, dry-suit certified divers with recent logged dry-suit dives can join this small-group adventure. Your guide provides gear, including a dry suit, and leads you through the crack, hall, cathedral, and lagoon: Bring your own base layer.
... More