Justice is slowly coming for the 11 BP workers that were killed in an explosion on the Deepwater Horizon drilling rig in April 2010.

Two former British Petroleum workers were indicted on charges of manslaughter with another worker charged with lying to federal investigators.

The court details were made public on Thursday after BP agreed to pay a settlement of $4.5 billion for the 2010 Gulf oil disaster.

The figure is comprised of around $1.3 billion in criminal fines, $2.4 billion for the National Fish and Wildlife Foundation, $350 million to the National Academy of Sciences and around $500 million for the Securities and Exchange Commission.

The April 2010 disaster is the nation's worst offshore oil spill and the recent criminal penalty payment by BP is the most ever paid in the United States.

Robert Kaluza and Donald Vildrine are accused under the indictment for neglecting to alert supervisors and engineers about safety flaws on the Deepwater Horizon rig that eventually lead to the deadly explosion.

Charges have also been filed for David Rainey, ex-BP vice president of exploration for the Gulf of Mexico. The indictment claims Rainey lied to federal investigators about his calculations for the flow rate estimate of the blown oil well. He has been charged with obstruction of Congress and giving false statements.

Attorneys for the accused men have responded to the indictments by professing their innocence.

"Bob was not an executive or high-level BP official. He was a dedicated rig worker who mourns his fallen co-workers every day," Kaluza attorneys Shaun Clarke and David Gerger said in a statement. "No one should take any satisfaction in this indictment of an innocent man. This is not justice."

But the prosecution's investigation continues to try and identify anyone else that may be linked to the deaths and the crimes of the disaster.

At a news conference, Attorney General Eric Holder said, "Our criminal investigation remains ongoing, and we'll continue to follow all credible leads and pursue any charges that are warranted."