In the mid-1950s, experimental studies of condensed matter at ultrahigh pre
ssures (i.e., high energy densities) started to appear in the literature, m
ade possible by using high-power shock waves for affecting the state of a m
aterial studied. Russia's Federal Nuclear Centers in Sarov and Snezhinsk an
d their Academy of Sciences counterparts in Moscow, Chernogolovka, and Novo
sibirsk were instrumental in developing dynamical measurement techniques an
d applying them to the study of extreme states of matter.