Cosco Guangdong will build the PX121 vessels for delivery in 2015.

The vessels are options attached to an identical order fortwo PX 121s signed in January.

All four are destined for European waters. No price wasrevealed.

“These two vesselsare part of the Vroon commitment to our business partners and will support usin meeting their service requirements in the best possible way,” said VroonOffshore Services managing director Jan-Piet Baars.

Ulstein