Iran says it has recovered the bodies of six Indian divers who were trapped underwater when their support boat sank in an Iranian oil field in the Persian Gulf.

Iran said rescue workers saved 60 of the 73 people on board the ship after it sank Thursday.

Iran says it found the bodies of six Indian workers Sunday in a diving chamber supported by the sunken ship. The fate of the other seven missing workers, including at least five Iranians and a Ukrainian, remains unknown.

It is unclear why the ship sank.

The ship was used to install underwater oil pipelines.