I wonder how the pressures were achieved. I remember a sciam article way back which discussed attempts to create metallic hydrogen in the lab using, in essence,

I wonder how the pressures were achieved. I remember a sciam article way back which discussed attempts to create metallic hydrogen in the lab using, in essence, g-clamps. (Only a tiny amount of substance could fit into the apparatus, of course. Still it was amazing that such a simple device could achieve the necessary pressure.)