What I would like to see is whether it is possible to build land mines that expire after a given period like a year, or 2 years, or else that can be turned off with a radio or cell phone signal when the war is over. So many needless injuries and deaths with mines, the bomb that keeps on giving.
They already have those... both electronic and chemical.
Non-electronic chemical timers are hard to pick up with mine detectors... any electronics inside makes for much easier detection.
Crude but similar chemical timers were placed aboard ships by saboteurs who were loading allied ships...usually incendiary devices designed to detonate in a few days..
The mines of course would not have a timer to cause detonation but to destroy a tiny part inside and prevent detonation after a time.
We have such devices.
Early mines, like in SE Asia and Egypt and the Sinai, those were old mines that did not have such timing devices.
We lay down a minefield and we tell everyone where it is.
Meant to shape the battlefield.
The enemy, however, has no interest in timing devices and does not publish locations.