• In this photo taken Sept. 27, 2016 in the flooded Hranicka Propast, or Hranice Abyss, in the Czech Republic Polish explorer Krzysztof Starnawski, left, and Bartlomiej Grynda, right, are reading images from a remotely-operated underwater robot, or ROV, that went to the record depth of 404 meters ,1,325 feet, revealing the limestone abyss to be the world's deepest flooded cave, during the 'Hranicka Propast - step beyond 400m' expedition led by Starnawski and partly funded by the National Geographic. (AP Photo/ Marcin Jamkowski)

    Polish explorer says he’s found deepest underwater cave

    WARSAW, Poland (AP) — A team of explorers say they’ve found the world’s deepest underwater cave, located at least 404 meters (1,325 feet) down a limestone formation in the eastern Czech Republic.