What this hole made for?

.....and on the second day in the wilderness, Daniel was set upon by thieves and bandits...
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That hole starts whistling at 200 kph! !!...cos the rider can't!!!
 
In days of old when knights were bold and women hadn't been invented they bored a hole in an engine block and had to be contented.
...lol.., that reminds me:
In days of old when knights were bold and Toilets weren't invented, they dug a hole, just like a Mole, and sat there quite contented!!
Amazing what crap information you retain from your childhood!!