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The US did an underground blast in Mississippi that was less than
this 0.55 yield.
(local folks remember their wells being muddy for quite some time)
The first detonation, to form the cavity, code-named Salmon, took place
in 1964 using a 5.3 kiloton bomb, placed at the bottom of a sealed 2,710
foot shaft. The second nuclear blast, a relatively small 0.38 kilotons
yield shot code-named Sterling, was exploded within Salmon's 110 foot
diameter cavity more than two years later
http://www.clui.org/clui_4_1/ludb/sites/MS3126.html
but this sub-critical mass needs a good tamper/reflector.
I'd wager that this was a fizzle rather than a sophisticated tiny device.
This means that they will be testing another one soon - fix things.