An underwater camera also showed pictures of orange barrels, with the word "toxic" on their side.
The mafia informant says he personally sank two other vessels and that he knew of at least 30 more ships sabotaged by the mafia.
The man, who is under house arrest, has told his interrogators that the toxic waste came from Italian and European pharmaceutical companies and the mafia was paid between $2m and $20m to sink the ships.
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