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Apparently, the oil company drilling an old well was blasting a particular underground sector with hot water, causing the "mystery blob." Once the water blast was turned off, the oozing, etc., stopped. So the drillers undermined the area in question. They will have to do a lot of repairs to shore up the affected area, including digging up and replacing the roads and sidewalks, not to mention making the necessary repairs to the residential properties affected by the goofy water blasting. What a mess! :impatient