Poisonous mud has forced thousands of people on the Indonesian island of Java to leave their homes.
The hot sludge has been spewing out of the ground, like lava from a volcano, for more than two months and has swallowed up eight villages.
The hot mud smells like rotten eggs and in some places it's 14m deep.
Engineers are trying to steer the mud away from further homes by pumping it into rivers which will carry it out to the sea.
They had tried building a barrier to stop the mud from spreading, but that didn't work so they are going to block the hole in the ground with concrete, but that will take months to complete.
Environmental experts are worried about pumping the mud into the sea because it's poisonous and this will kill off sea life in the area.
They think it could be up to 100 years before the sea recovers.
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