Plans to extend the KPE to join the AYE began on 9 March 2006 to relieve congestion of the East Coast Parkway, and would be called Marina Coastal Expressway. Feasibility studies were conducted for the new expressway, and then Transport Minister Raymond Lim later announced on 27 July 2007 that approval had been given for the construction of a new 5 km long Marina Coastal Expressway (MCE) at a cost of $2.5 billion. The expressway, which includes Singapore's first undersea tunnel, links the East Coast Parkway and Kallang-Paya Lebar Expressway to Marina South and Ayer Rajah Expressway and opened to traffic 29 December 2013.