Critical evidence from the bulker that collided with the Iranian tanker Sanchi in the East China Sea in January cannot be recovered, creating a blind spot for investigators probing the accident that claimed 32 seafarers’ lives.

While the voyage data recorder (VDR) from the 164,000-dwt, 2008-built tanker that was destroyed remarkably survived, the VDR on the Chinese-registered, 76,000-dwt CF Crystal (built 2011) was overwritten.