Was just transiting the Shetland Orkney gap.
Aircraft spotted, crash dive.
Came slowly up to periscope depth.
Aircraft still there (he must have seen me before I got under), I thought I'd stick around and see what happened, and kept observing him through the scope.
Guess what - he made several strafing runs at my periscope!
Then for the rest of the day loads of his mates kept showing up.
Excellent work Wamphyri
Much better than stock.