“We believe a drone was used to fly in the tools that allowed him to escape,” South Carolina Corrections Director Bryan Stirling said. He said investigators were still trying to confirm that, and he didn’t elaborate on why they believe a drone was involved.

But an official aerial photo of the prison shows rings of tall fences and an expanse of more than 50 yards between the prison perimeter and the cellblocks, making it unlikely someone could have thrown or catapulted tools to him"

Full story here:
https://apnews.com/8f514ec346e143bfaf6041b6c3264d3e

To

Seems odd that one of the guard towers didn't see the drone fly over and drop the stuff.