On August 9, 2013, IHC Merwede signed an agreement with Subsea 7 for the design, engineering and
construction of three 550t pipelaying vessels.  The first, the SEVEN RIO was launched on November 28, 2014
at the yard of IHC Offshore & Marine BV in Krimpen aan den IJssel, The Netherlands. 
The three ships are of identical design to the 2014 delivered SEVEN WAVES.