Samples and associated geological data are held at the British Geological Survey for Maritime Coastguard Agency (MCA), Civil Hydrography Programme (CHP), Bathymetric Survey HI1433; Thames Routine Resurvey 2013, Thames Estuary - TE3A Sunk Focussed, Area in SqKm: 6; Thames Estuary - TE5A Sunk DW, Area in SqKm: 4; Thames Estuary - TE5A Long Sand Head, Area in SqKm: 5; Thames Estuary - TE19 Fishermans Gat, Area in SqKm: 3; Thames Estuary - TE14 North East Spit, Area in SqKm: 15, (01/09/2013 to 01/12/2013), Standard: IHO S44ed5 Order 1a. Contract: RRS. FY 2013/14. Contractor: EGS.