The SB-81 mine is a type of explosive device that is designed to be hidden in the ground and explode when someone steps on it. Imagine if you were playing a game of hot lava and you stepped on a hidden rock that made a loud boom and sent you flying in the air. That's kind of what happens with the SB-81 mine, but it's much more dangerous and deadly.
The mine looks like a small cylinder and can be buried in the soil, so you can't see it. It has a pressure plate on top of it and when someone steps on the plate, it triggers the explosive inside the mine to go off. It's designed to cause maximum damage to the person who steps on it and potentially kill them.
The SB-81 mine was first used in the Vietnam War, and many people were injured or killed because of them. Nowadays, using these mines in war is banned by international law because they cause so much harm to civilians and soldiers alike.
In conclusion, the SB-81 mine is a dangerous explosive device that can be hidden in the ground and is triggered when someone steps on it. It's important to stay away from areas where these mines could be present and to remember that they are very harmful to people.