A drone flight over a beach with old wooden groynes and mudflats, with homes behind a sea wall on the left, on tidal estuary at low tide on a clear and hot summer day

drone fly flight old wooden groyne erosion beach mud mudflat estuary tide tidal green algae seaweed water sea nature ripples ridges brown blue sky small white clouds reflection mirror shadow natural environment abandon military garrison gunners park shoeburyness essex wet home house estate low clear hot summer day thames river