The ancient Romans already knew cold storages. Due to enormous demographic problems (deflation as in China today), invasions from the north and east of the empire, recurring waves of plague and economic crises, the Roman Caesars massively inflated their currency, especially in the third and fourth centuries, which led to valuable coins that were still pure in content being hoarded and hidden by their owners.

Over 18,200 such coin hiding places have been discovered and archived by archaeologists around the Mediterranean. The photo here shows an amphora of 10 found by construction workers in Tomares in Spain in 2016. The owner of this 'cold storage' had kept coins, which today are worth around half a million dollars, safe from the authorities and confiscation. History may not repeat itself in detail, but it rhymes in a wonderfully harmonious way.

As a supplement: for those of you who are interested, this map shows the current locations of hoarded Roman coins, over 18,200 in number and over 6 million individual coins have been found so far. People tried everything to keep their savings safe from the state and invaders. https://chre.ashmus.ox.ac.uk/