We sailed on 7 February for Hamburg, but a day before we arrived we had to change the programme due to ice. Although the ice in Hamburg was relatively thin, and merchant ships were using the harbour, we would be in for 5 days, and with colder weather forecast we did not want to risk being iced-in, or damaging our rudders and compromising our deployment. So instead we turned left and went down the Kiel canal to the ice-free port of Kiel.