The two parties reached a $282m deal for the 2013-built Siem Daya 1 and Siem Daya 2 in August 2014.

Malaysian oil company Daya currently has the vessels on charter.

In January, Daya handed over a $1.4m deposit and was granted an extension in order to line up financing.

Siem Offshore is looking at a profit of $64m on the trade.