Hranice Abyss (Czech: Hranick? propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic.
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In the Pacific Ocean, somewhere between Guam and the Philippines, lies the Marianas Trench, also known as the Mariana Trench. At 35,814 feet below sea level, its bottom is called the Challenger Deep — the deepest point known on Earth.
The karst landscape is the most widespread landscape type in Slovenia. Classical Karst covers the area between the Ljubljana Marsh (Ljubljansko barje) and the Bay of Trieste. There are around 6,000 known and explored caves in this area that cover approximately 6,400 km2 or 27% of the territory of Slovenia.
Swimming is not a requisite for the Son Doong Expedition, as there are no required swimming sections. However, you have the option to take a dip and enjoy a swim at the Hang En cave – the world's 3rd largest cave.