Wednesday, two people who were rig supervisors of the BP Macondo well that blew up and killed eleven men in 2010 both entered a plea of "not guilty" to the charges against them.

Robert Kaluza and Donald Vidrine were BP well site leaders.  They were charged with manslaughter after eleven rig workers died in the explosion and fire.  Prosecutors contend that Kaluza and Vidrine ignored abnormally high pressure readings that they say should have been a clear sign of trouble looming for BP's Macondo well.

A former BP executive, David Rainey, also pleaded "not guilty" to criminal charges related to the Deepwater Horizon rig explosion and the company's response to the massive spill in the Gulf of Mexico. Prosecutors charged Rainey with covering up information about the amount of oil that was leaking from the well.

All three men remained free on bond following their arraignments in federal court yesterday.