If you have it secured in a vault it might just remain.....only joking.
I have heard the same rumour but there are so many bikes. If you hide it in the middle of hundreds im sure it will be difficult to steal if it is very well chained up....i mean two chains and possible a motorcycle chain because they are so strong...i wonder if anybody has ever used one, I certainly would because they are so much stronger than normal bicycle chains.
Also, I was just thinking. People are always walking around Cambridge, wherever you are, and I know that bicycle thefts do occassionally occur but a person desperately walking around with a huge cutter isn't going to look the most innocent.
Don't worry...you must able to insure bikes somewhere, you could even attach an alarm to it somehow, or maybe that is a bit over the top!!