With the water depth of 0.5M that puts standing water level on both my vehicles above the bottom of the doors by around 100mm, so that could be an issue if the door seals were iffy, when my RR was standing in water at a Ford it was half way up the doors so around 600mm but that level soon lowered when underway with the crossing.
Just I typo was it not, calling millimetres centimetres. Like most in engineering I only deal in metres and millimetres, dress makers use centimetres
To be honest, with my disc player under the passenger seat in one car and under the drivers seat in the other, I doubt I would ever want to get that deep. I would want to absolutely be certain that once started I would not have to stop till I got out the other side, hence only fords or flooded tarmac.
