Deepwater Horizon Survivors Tell ABC News No Alarm Sounded Before Blast, Safety Gear Failed

It Was Chaos,' Says Survivor; Industry Officials Acknowledge Failures Of Safety Equipment On Oil Rig.

Survivors of last week's massive oil rig explosion have told ABC News that alarms meant to warn them of an imminent blast never sounded, and oil industry experts now agree that a critical failsafe needed to prevent the blast and the subsequent spill didn't work.

Deepwater Horizon rig workers say there was no alarm before the first blast.They were two crucial safeguards that failed during the chain reaction that left 11 workers on the Deepwater Horizon dead and led to what some now believe could be the worst oil rig disaster in U.S. history."It was chaos," survivor Dewayne Martinez told ABC News. "Nothing went as planned, like it was supposed to."

 Martinez and survivor Micah Sandell described the grotesque scene that followed the first concussion on the rig, when a huge plume of gas vapor belched from the well and encircled the Deepwater Horizon, and a second, larger burst, when that gas cloud ignited.