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Last month, a court in Argentina dropped charges of criminal negligence against three out of the five people who had been charged in connection with the performer's death.

It also reported that Russian authorities are investigating for criminal negligence.

Marine Investigations Board Chair Jason Neubauer told NBC News on Monday the hearings aim to determine the extent of any criminal negligence or misconduct which may then be referred to the Justice Department.

His employer is now under investigation for criminal negligence and manslaughter.

The officials, including a former fire chief, received sentences of between 15 and 111 years for multiple counts of criminal negligence resulting in injury and loss of life.