  We numerically study the evolution of a small turbulent region of quantised
vorticity in superfluid helium, a regime which can be realised in the
laboratory. We show that the turbulence achieves a fluctuating steady-state in
terms of dynamics (energy), geometry (length, writhing) and topology (linking).
After defining the knot spectrum, we show that, at any instant, the turbulence
consists of many unknots and few large loops of great geometrical and
topological complexity.
