NEW ORLEANS The massive blowout preventer that was supposed to prevent the type of explosion that killed 11 men and resulted in the largest oil spill in the nation's history is being inspected after arriving at the NASA Micoud facility over the weekend.

Forensic investigators have begun working on the preventer to determine what caused the device to fail.

In addition to the blowout preventer, two other pieces will be inspected. Those pieces include the lower marine riser, and something called the spool piece that connects the two.

The blow out preventer was supposed to regulate pressure from the well to prevent the kind of accident that occurred. Forensic scientists are going to examine not just what went wrong, in which piece, but in what order things failed.

The blow out preventer is under tight, 24-hour security at the facility.

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