Considerable confusion on this one.
LMIU says IMO was 7393341, which is the sort of smaller tanker
that would visit Cristobal.
The name we have for her is Moa 1.
There was a 225,010 dwt OBO called the Alva Sea, IMO 7329168.
This ship suffered structural failures off South Africa
in 198204 and 198411.