Underwater diving snorkeling footage following the mid Atlantic ridge fissure in Thingvellir Iceland 1

scuba diving snorkeling underwater tectonic plates aquatic diving scuba snorkel diver dive swimming swim snorkeler depth glacier water formation national park sea ocean travel fissure tourism water blue reflection adventure canyon iceland tectonics green icelandic rocks beautiful marine nature pingvellir clear transparent tourists visibility thingvellir pure volcanic freezing colorful lava deep natural crack continental