What is this embedded in my concrete driveway

https://preview.redd.it/xb9vwrf757xg1.jpg?width=2449&format=pjpg&auto=webp&s=5304695cfbc25972be8c0e92f9826531b7ac5546

https://preview.redd.it/4qvq4cf757xg1.jpg?width=3000&format=pjpg&auto=webp&s=98faa52a1e83c333c9b8f9eab535bea6d1013bcf

Anybody know what this metal thing is embedded in my concrete driveway. I'm assuming it has caused this concrete failure hole over time. Is it capping something? It seems like a strange place to put an anti-personnel mine.