Recently I have found an information about problems with fiber cable which was damaged (probably intentionally) and causes some networking issues:
https://trust.zscaler.com/zscloud.net/posts/12256

It made me think - is it possible that bitcoin nodes network would be split? I know that many connects to many etc, but what if "2 bubbles", similar size, enough to be fully functional, would be created? Imagine that for example South&North Americas lost connection to rest of network (no oceanic cables, no satelites etc etc).
Is it possible to detect that you are in a separated bubble? I assume we would have 2 chains, which would make it impossible to merge.
From the point of single node it would only mean that you lost some connections but you are able to quickly find replacements. At the end now, when you have your node and you are connected to 10 other nodes, you do not know if you are connected to Asia and Australia or to your neighbors on the next street - there is no criteria for nodes selection, is there?