Four men were pulled from a trench after it collapsed on the SCSU campus on Wintergreen Avenue in New Haven on Tuesday morning.
The workers were were trapped around 9:20 a.m., according to New Haven fire officials.
Three of the victims were able to free themselves, but the fourth needed to be rescued by emergency crews.
"Very, very lucky individuals. It could have been a lot worse, said New Haven Battalion Chief William Gould. "We don't know what caused the collapse, that will be investigated."
All four suffered non-life threatening injuries and were taken to the hospital to be checked out, Gould said.
The workers were installing a water line when the collapse happened, according to New Haven mayor Toni Harp.
Personnel from OSHA have been asked to respond to the scene.
Local
Wintergreen Avenue was closed for about 90 minutes, but reopened just before 11 a.m.
