Detailed Instructions: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Q: Passage: They flew a mission to the Lofoten Islands on 9 July 1944, searching the coastal shipping lanes and photographing the mainland town of Bod. Bad weather in northern Scotland on their return prevented a landing, and they finally landed at RAF Leuchars with just 10 gallons left in the fuel tanks. On 12 July, they again flew, via a refuelling stop at RAF Sumburgh in the Shetland Islands, to the Lofoten Islands, and then on to Altenfjord, to search for German surface vessels, flying 750 miles to the Norwegian coast above thick cloud. The top cover of their aeroplane blew off as they descended towards the fjord to make their photography run, subjecting the crew to freezing temperatures for the remainder of the flight. They made a photographic run over the targets they found, including the Tirpitz. They lost their codebooks through the open hatch, so were unable to obtain radio assistance on the way back. They flew 2,300 miles in a mission that lasted nearly 8 hours, landing at RAF Wick, but were immediately refuelled and sent on to Leuchars for the photographs to be developed. The intelligence brought by these missions were of crucial importance: Flight Lieutenant (later Air Vice Marshal) Dodd was awarded an immediate Distinguished Service Order and Flight Sergeant Hill an immediate Distinguished Flying Medal. The citations were gazetted on 8 September and read:
Link Information: none Answer: none
A:
What class of ship was the German surface vessel seen?