A worker has died after becoming buried when a trench collapsed at an Iowa construction site. The accident was reported just before 8:30 a.m. Friday at an apartment building construction site in Dubuque. The fire department says firefighters arrived to find the victim’s co-workers trying to dig through as much as 8 feet of soil. Rescuers recovered the worker's body at 9:46 a.m. The cause of the accident is under investigation.