British oil company BP has once again filed suit against one of its primary contractors, Halliburton, in the dramatic Deepwater Horizon oil rig explosion from the summer of 2010, according to Bloomberg.

Since soon after the explosion, which leaked more than 4 million barrels of oil in the Gulf of Mexico and killed 11 rig workers, the company has been engaged in an ongoing legal struggle over who bears responsibility for the leak.

With $14 billion spent on the immediate aftermath of the explosion and cleanup of the surrounding region along with $20 billion set aside for economic losses from residents and substantial government fines, BP's costs ranged around $42 billion.

Now the company has once again filed suit against Halliburton, which was responsible for the failed cement in the oil well, seeking to hold the company liable for the entirety of its losses.

Reuters reports that BP recently came to terms with one of its three main contractors at the rig, raising the possibility that the others could soon follow, but Halliburton and rig operator Transocean have proven more stubborn so far.

More information about the Deepwater Horizon explosion can be found at PennEnergy's Research area.