A bus became trapped in a metre-wide hole in a road in Weston-super-Mare, Somerset, on Tuesday.
The vehicle, owned by First, is thought to have got stuck after a burst water main caused the collapse, according to Avon and Somerset Police.
Eyewitness Elizabeth Island said the driver of the single-deck bus looked "in distress".
Speaking to the Western Daily Press, she said: "The drain must have subsided. He cannot move and the road is now flooding."
According to the BBC, a First Bus spokesman said: "There were passengers on board the bus at the time of the incident but no-one has been injured."
Just last week, a double decker bus carrying 16 passengers toppled over into a ditch in Somerset, injuring two.
The number 21 Taunton service crashed just after 1pm on the Coast Road in Burnham-on-Sea, Somerset.
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