Lawyers defending a Guantanamo Bay detainee facing the death penalty sued the Department of Defense in a federal court Tuesday claiming they’re forced to live and work in facilities with high levels of cancer-causing toxins.

The plaintiffs, current and former U.S. JAG Corps lawyers and civilian attorneys, are defending a detainee who faces the death penalty in military legal proceedings at Guantanamo Bay’s Camp Justice. The Navy began investigating possible environmental hazards at Camp Justice in 2015 after a lawyer filed a complaint.