While Traveling from Muros to Ribeira we had an encounter with Orcas. We were motoring in calm conditions, but the fog was pretty thick. Suddenly we felt like we hit something, and then 5 seconds later we felt another bump. 

We're pretty sure it was Orcas as they had disabled a boat the day before in the exact same bay, but our rudders are Aluminum, and it was probably pretty tough on the Orcas as they are used to hitting Fiberglass rudders that will easily break. 

No other incident after that, so we continued on to Ribeira.