The High resolution sonar for the archaeological investigation of marine aggregate deposits project was undertaken by the University of Southampton and funded through the English Heritage disbursed Aggregates Levy Sustainability Fund. The project investigated the potential of state-of-the-art, high-resolution, sonar systems for the investigation of marine aggregate bodies for archaeological material. This project aimed to tackle fundamental problems to the detailed archaeological investigation of coarse grained aggregate deposits. This aim was achieved through the optimisation of new Chirp sources, developed by the School of Ocean and Earth Science, University of Southampton, in conjunction with GeoAcoustics Ltd, Great Yarmouth, specifically for the penetration of coarse grained materials.