sentences:  It passes Paglesham, significant for its native oysters and the location of Charles Darwin's HMS "Beagle" which lies under the mud west of Paglesham's boatyard and slipway.After being retired from the Royal Navy in 1845, the vessel was used by the Coast Guard as a watch ship.It was moved to the centre of the river near Paglesham in 1850, eventually becoming "Watch Ship No.