The Mirror US on MSN9mon
Deepest blue hole in world could have labyrinth of tunnels - but scientists can't reach bottom
A deep blue hole in the ocean in Mexico is the deepest known sinkhole in the world - and ... with some companies claiming ...
Detroit Free Press17d
Video shows massive sinkhole in Japanese city swallowing truck: Watch
A sinkhole estimated to be the size of a large ... According to government officials in Saitama Prefecture, the collapse may have happened due to a heavily corroded sewage pipe that runs 10 ...