Can any of the old and bold help me out . My grandfather was a submariner during WW2 . He served on HM/SM THUNDERBOLT (was called the Thetis then raised and renamed ) and also HM/SM URSULA. Well he has passed on , just the rest of the family are trying to find out more about his war time service.I know he was in the med a lot and the URSULA was sold on to the Russians . But if anyone could help me out with info on any of the above i would be very grateful .