Stonehenge and its Environs 134
Image by Chance

It's made a lot easier if you use two boats, one for the stone and another with the oarsmen to tow it.
Good point; that would have the added advantage of the oarsmen being able to cut loose if conditions at sea got unpleasant.

"that would have the added advantage of the oarsmen being able to cut loose if conditions at sea got unpleasant."

I nearly said that, but then I had the thought that the stone might have been considered more valuable than the men. :o|