The river Dargle, Bray [Co.Wicklow] last night (top) and this morning (above).

Flood defence works mishap?

Or late night shenanigans?

We may never know.

Update:

An incident occurred on Friday afternoon during routine flood defence works on the Dargle river in Bray, a digger slipped down an embankment and into the river. The driver of the digger was rescued and is recovering. 

Thanks Ger Corbett