sentences:  The United Brotherhood of Carpenters and Joiners of America petitioned the Federal Government in 1975 to issue an emergency temporary standard covering all professional diving operations, which was issued on June 15, 1976, to be effective from July 15, 1976.This was challenged in the US Court of Appeals and was withdrawn in November 1976.A permanent standard for commercial diving was subsequently formulated which became effective from October 20, 1977.