Authorities are also hunting for additional fishing boats that may be using poor migrants for forced labor.

Authorities in Papua New Guinea have rescued eight fishermen held on board a Thai-owned refrigerated cargo ship, and dozens of other boats are still being sought in response to an Associated Press report that included satellite photos and locations of slave vessels at sea.

Two Burmese and six Cambodian men have been removed from the Blissful Reefer, a massive quarter-acre transport ship now impounded in Daru, Papua New Guinea, about 120 miles north of Australia. Officials said the fishermen appeared to be part of a larger group of forced laborers being transported from Thailand to be distributed onto various fishing boats, said George Gigauri, head of the International Organization for Migration in Port Moresby, which has assisted with the operation.

Gigauri said that nearly 20 other crew members from the Blissful Reefer have not yet been questioned, and that if victims of trafficking are found, “there are lives at risk.”

The men are part of a seemingly inexhaustible supply of poor migrants from Myanmar, Cambodia and Laos who are forced to fish for the Thai seafood industry. When workers run away, become sick or even die, they are easily replaced by new recruits who are tricked or coerced by false promises of jobs in Thailand.

The ship Blissful Reefer appears to be connected to a trafficking ring exposed by the AP that was sending seafood caught by slaves around the Indonesian island of Benjina to the U.S.