He was trapped at 1705 Dean St. after a trench collapse there, the FDNY said.
Peter Zepf was helping put together the arena's "green roof" on Tuesday.
The man was hurt in a construction accident at 60 Beach St., officials said.
A worker had been installing copper piping when he slipped from his ladder, witnesses said.
The man fell through a wooden platform while trying to guide a crane at 252 E. 57th St., officials said.
The man was crushed by a concrete wall that fell in Hell's Kitchen, officials said.
Two construction workers were taken to Bellevue after getting hurt at 16 Morton Street, officials said.
A private contractor was upgrading electrical equipment at a bridge building when he died, the MTA said.
The unidentified man was injured at the commercial building site during concrete placing operations.
The worker fell 12 feet at the site, which has seen two other falls in the past year.
A three-story home under construction on Prospect Place crumbled, hurting eight men, fire officials said.
Jaime Sillart, 56, died Friday after falling 70 feet from scaffolding on an NYU building.
The D.P. Consulting & Construction Corp. employee was working on the facade of 19 University Place.
James Lomma, who was cleared in a fatal 2008 East Side crane collapse, owned the rig, officials said.
A construction worker in Sheepshead Bay was buried up to his chest in a trench, fire officials said.
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