Joe here in Orlando, Florida

I am sorry to bother so much but I am so confused right about now.

I broke the 4 inch bolt as I was replacing the water pump. I have been getting advice from a different forum. I couldn't get them to understand until a guy posted this figure below. Now someone is saying that if I drill what is left of the bolt which is only 1/2 inch, the broken bolt may drop down into the cavity of the engine. Can someone please verify this?

|------------- 4" ---------------- |
|--1/2"-|
-----------------------------------
|/ / / / /{
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