Ian MacLeod has a Ph D in electrochemisty and a D Sc in materials conservation of shipwrecks. Shipwreck artefacts provide logged data on the oceanographic microenvironment reaching back for hundreds of years. Graphitisation of cast iron on reefs provides a very reliable modelling of the flux of dissolved oxygen in a highly turbulent situation. Uneven concretion patterns warn of localised attack as the rate of concretion formation responds to localised corrosion rates as does the in-situ pH. Asset management teams need to tap into this resource to protect infrastructure which is being pushed beyond original design life.