A 330ft deep and 60 metres diameter hole, opened up in Guatemala earlier this June and what is so weird is that it is perfectly circular. It has not been reported that anyone has been killed but a lorry and up to twenty houses were swallowed by it.
This phenomenon is common in places that have limestone bedrock interspersed with caves, and is common in all continents except Antarctica. This bedrock that contains carbonates, such as limestone, are prone to chemical weathering, so these holes can be caused when the underground caves can no longer support the sediment above them, and so they collapse, and can also be triggered by a tiny amount of rain.
When i saw this i was astonished but it reminded me of Fantastic four: Rise of the Silver Surfer 🙂