CCTV from a nearby noodle shop in the north-eastern city of Harbin showed the moment the ground suddenly gave out beneath the group.
Three people plummeted directly into the hole, while two others can be seen tumbling from the edge.
One woman was able to break her fall by clinging to an underground pipe.
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The estimated 3m hole is believed to have been caused by heavy rain leaking from an underground drain pipe.
Check out the footage below:
Four people suffered injuries to their feet, legs and shoulders in the incident, Chinese media reports.
A fifth person was unhurt.