"It sounded like a bomb was dropping. Boom!" said Carlos Gutierrez, 58, of the crater, which measured 130 feet in diameter.
The crater appeared in the capital's San Antonio neighborhood on Thursday night. Authorities evacuated hundreds of people on Friday fearing more land could collapse into a fast-flowing river of sewage below.
The pit emitted foul odors, loud noises and tremors, shaking the surrounding ground. A rush of water could be heard from its depths, and authorities feared it could widen or other sinkholes could open up.