Experts are dropping a set of concrete balls into a mud volcano in order to stop an eruption of poisonous sludge that has destroyed thousands of homes.
Mud has been pouring out of a crater in Indonesia for nine months, and some think it could go on for years to come.
At least four of the balls, which are chained together, have been dropped into the hole to try to block it up.
Some think the eruption was set off by people drilling for gas, but others say it was caused by an earthquake.
The plan is to drop about 1,500 balls into the crater to slow down the mud flow.
Work will start slowly, but it's hoped up to 50 chains of balls could be lowered into the hole every day.
Some 13,000 people have been forced out of their homes since the river of dangerous mud burst from the Earth nine months ago.
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