Instructed to provide quantum expert services for underground civils works associated with a US$3.5bn pumped-storage power station in an extremely sensitive ecosystem in Southern Africa. The 1,332MW hydroelectric scheme comprises upper and lower dams 4.6km apart, connected by underground waterways passing through a subterranean power house with 4 x 333MW generators. Key issues investigated included NEC principle dispute on valuation methodology, challenge to adjudicator’s decisions, and disputed variations.