The previously unreported comments come amid an ongoing police investigation into the January cut, which left Tonga drastically cut internet services for 12 days.
The Turkish company Duzgit has said it's co-operating with Tongan authorities, who have stayed mum on the investigation.
But RNZ Pacific can reveal the company's ship, the Duzgit Venture, was carrying fuel for the French oil giant Total when the cable was cut.
A Total spokesperson says Duzgit told it in February that it could have "trapped a cable with its anchor" in Tonga on the first day of the outage.