Use the search engine, there are a lot of trip reports and other posts that will be able to quickly answer your question and give you a good idea of what a k-hole is like.
We have a thread on it, it's a subthread of the Ketamine Big & Dandy. Next time you can discover this for yourself by using the FAQ and the Index together (both linked in my signature) so please do so, it's designed to be practical that way.
For now here's the K-hole thread, you can read it and post if you have any more questions, or remarks.