For Future Reference...

'Aqua Bikes' ~ you know, those 3-wheel pedal things you take on rivers... are a lot more work to propel than you might at first think.

And 6 metres doesn't sound very deep, but try converting that to an Imperial measurement of around 20 feet, then question the wisdom of pedalling downstream on an unknown river in a craft you've never used before, fully clothed with no lifejacket but wearing expensive leather boots.

Such are the places my whimsy takes me... us.