  High-frequency (up to ${\omega} = 6 \, 10^4$ rad/s) rheological measurements
combined with light-scattering investigations show that an isotropic and
multiconnected phase of surfactant micelles exhibits a terminal relaxation time
of a few {\mu}s, much smaller than in solutions of entangled wormlike micelles.
This result is explained in terms of the local hexagonal order of the
microscopic structure and we discuss its relevance for the understanding of
dynamic behaviour in related systems, such as wormlike micelles and sponge
phases.
