There is a wonderful book about it. Trees communicate mostly through their roots. When one tree, is for example, sick, the other trees can feed it through the roots and so it can survive for a long time. They also send each other electric signals. When trees are in danger, they send an odor in the air to warn the neighbor trees. Here is a link of the book. You can find it also as an audio book on audible. https://www.thalia.at/shop/home/rubrikartikel/ID40981527.html?ProvID=10907922
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Yes, @geniusloci mentioned that book already here. I was there again this morning and it looks like this tree was in the middle of a small group, so it's very likely that the roots of all these pines are connected.
I think it's still alive because the other tree stumps are rotten and eroded:
Thank you for the photos, sorry I did not see that someone else wrote about the same book;)