I'm just having a little poke at bonkas and you know that
Seriously think that flowing water in a tunnel is risky, fun sure but risky. And yes I'd agree it was well driven other than maybe tad slow but bow waves in a tunnel are unpredictable.
My concern isn't for the motor stalling etc so long as there was help nearby for recovery but rather for a rapid change in water flow/levels which can easily be caused by any number of things......a landslide behind or a bank washing though ahead which could lead to a real life threatening situation and emergancy service response.
We all take risks but a situation like the tunnel has too many unknown variables to risk for a laugh....for my tastes anyway.
how often have you changed a wheel using a jack without axle stands, theres more risk in that, but something we have all done at some time