Oil producer ConocoPhillips said all staff were safely evacuated from a jackup rig that tilted and sank off the coast of Malaysia on May 4.

The Naga 7 jackup was being placed at a site off the coast of Sarawak state when one of its legs penetrated the soil, according to owner Velesto Energy. No drilling had begun.

“All persons on-board have been safely evacuated off NAGA 7 with no known injuries,” ConocoPhillips spokesman John Roper said.

A total of 101 employees were transferred to rescue vessels, according to Velesto, which said it had begun an investigation and was evaluating recovery options.