Workers in the U.S. Capitol who say they were exposed to dangerous levels of asbestos in the tunnels under Congress have settled whistle-blower claims against the architect of the Capitol.

The settlement was announced Monday by both sides, but the amount of monetary compensation received by the workers was not disclosed. The 10 steamfitters had claimed they were harassed by the then-architect of the Capitol, Alan Hantman, and his staff after they complained about the asbestos in the tunnels.