Exploring the Longest Underwater Cave in Russia. Ordinskaya or the Orda Cave is the longest underwater cave in Russia. Accoridng to the Orda Cave Awareness Project it is the first and only underwater gypsum excursion cave in the world.
An Ice cave in Vatnajökull ice cap, southern Iceland. Vatnajökull is the largest ice cap in Europe, around km³ constanly changing it's formation. The texture on the "floor" is snow mixed with volcanic ash from Grímsvötn, last erupting May