Ice cores are a few inches across. The photo at the top of the article is not of the drill hole but of the hole they had to dig in the snow to get to the ice they actually drilled.
See the photo of the final ice core [1] to see how miniscule the actual drill hole is.
See the photo of the final ice core [1] to see how miniscule the actual drill hole is.
[1] https://science.ku.dk/english/press/news/2023/pay-dirt-for-i...