Low drone flight over estuary mudflats and a beach separated by old wooden groynes at low tide, with a seawall and an abandoned military garrison on the right-hand side, on a clear and hot summer day

low 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 abandon military garrison gunners park shoeburyness essex container ship transport wet clear hot summer day thames river environment