My girlfriend and I had swam out after the sun had gone down to a raft about 300 feet off shore in the later part of August. We stayed on the raft till it was getting a little chilly and headed into shore. She was a good swimmer and was ahead of me. The shoreline has quite a sharp drop from the high tide to low tide which consists of smooth rocks.
It happened to be a very high tide that evening. She had just walked onto the beach and I was just touching my toes into the rocks as I was swimming in behind her. All of a sudden I heard a loud blast of air/water spray and a grunting type noise right behind me. I turned my head to see the spray of a Bull Orca (killer whale) surface directly behind me. It had a massive dorsal fin which I would estimate to be about 10 feet high. It was with no exaggeration no more than 7 feet behind me.
It obviously was watching me and fully aware of us swimming into the shore. My heart skipped a beat or two but I realized that it already had pased and by that time I was on the shoreline. It surfaced a few more times and went around a little island, "Dick Island", where there were 13 more orcas swimming around. That was close enough for me and a memory and experience I treasure to this day.
Message to Canadians: Stay in shallow water when swimming...especially at high tide :)