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Lake Vostok (ボストーク湖 Bosutōku Mizūmi?) is where the coffin surfaced and is a vast underground lake located beneath 4 kilometers of Antarctic ice, encompassing over 14,000 square kilometers and that's approximately six Skytrees worth of ice covering 294,000 domed baseball stadiums worth of water.
According to Aoi Tomosato, there is a Russian observation post on it.