They entered and identified it as UC-70 of the Second Flanders Flotilla. She had left Zeebrugge for the Whitby area on 21 August, commanded by Oberleutnant Karl Dobberstein. She was believed to have been damaged in a new British minefield off the Yorkshire coast and to have been effecting repairs when spotted. There were no survivors from her crew of 31. Slack water is 2 hours after high and low water at Whitby.
Visibility is generally better on the high-water slack.
From the south, leave the A1 on the A64 past York and continue to Malton. Then follow the A169 through Pickering and past Fylingdales to meet the A171 just west of Whitby. From the north leave the A1 on any one of a number of roads to Middlesbrough and Teesside. Once south of the river take the A171 to Whitby. In Whitby, continue along the A171 until you are in the valley, then turn left towards the harbour.