Submarine versus freighter

[Brent Swain]

I remember sailing north from Hawaii one clear moonlight night, when I hit something very solid, which catapulted me out of my bunk. When I looked back there was something large, rounded on top, and black, silhoueted in the moon light. Later I found a dent in my topside near the mast.
Crossing Georgia Strait ,near Nanaimo, I saw a ripple on the water ahead, which transformed itself into the conning tower of a sub. Had I been a few minutes earlier ,it would have been under me.
A tug, which sank suddenly, without warning, in Georgia Strait, was suspected of having been sunk by a submarine from the Nanoose sub testing range