Can metals burn underwater? Can metals burn in air, with no ignition source? The answer is a definite yes, that there are multiple metals that can and have been known to do both of the above given the opportunity and right circumstances. Many of the most toxic, radioactive and deadly dangerous man made artificial elements created by the nuclear industry are pyrophoric.
The nuclear monopoly wants to keep this information secret, because if the general population ever found out how dangerous, toxic and deadly plus explosively pyrophoric many of these man made artificially nuclear scientist created elements really are, the entire nuclear monopoly would be shut down in a heart beat.
via Pyrophoric Radioactive Cesium Can Burn In Air and Explode Underwater Just Like Radioactive Depleted Uranium, Hafnium, Thorium, Plutonium, Cerium, Neptunium, Sodium, Plutonium, Radioactive Lead, Cesium 137, Strontium 90 | A Green Road Journal