Tsunami in the Pumicestone Passage?

[Dignity]

Went with a mate flicking for flatties this morning, to say it was quiet is an understatement, the fish had just no interest and we tried every lure and covered quite a bit of territory. The best we got was 2 half hearted hits but no hook up, I did manage one fish around 150mm though.

The weirdest thing is that we were fishing along the inside of Bribie, about 3km south of the new bar. There wasn't a boat in sight even a jetski and we had clear vision probably 1.5 km both north and south of our position. Water was calm, a light NE blowing. All of a sudden we were being rocked by what felt and looked like boat wash except no white water, but nothing had passed us for at least 20 mins. About 10 mins later a jet ski did come through but as he was in the channel about 100m away the wash from him was barely a ripple by the time it got to us.
This effect was only noticeable due to the lack of boats on the water.
Anyone like to throw some theories out there.
PS: have yet to hit the sauce bottle today