The Northern line extension to Battersea runs from Kennington to Battersea in southwest London, terminating at the redeveloped Battersea Power Station. The work forms a continuation of the Charing Cross branch line. It comprises two new subway stations at Battersea Power Station and Nine Elms, terminating in a new embassy district, including, among others, the U.S. Embassy and the Dutch Embassy.

Protecnium contributes to the work with a Draftsman, BIM specialist, tunnel shift engineers, Tunnel and Auscultation supervisors and assistants.