In October 2014, Visby was amongst the Swedish vessels patrolling in an exercise for finding the source of "foreign underwater activity" which was rumoured to be a Russian submarine, identified by distress call. This rumour was denied by the Swedish authorities, who described it as an "intelligence operation".
In October 2014, Visby played a role in a Swedish naval exercise aimed at pinpointing the source of alleged "foreign underwater activity," which was believed to be a Russian submarine that had sent out a distress signal. However, Swedish officials later clarified that this was actually an intelligence operation.