  The collective tunneling of a Wigner necklace - a crystal-like state of a
small number of strongly interacting electrons confined to a suspended nanotube
and subject to a double well potential - is theoretically analyzed and compared
with experiments in [Shapir \emph{et al.}, Science {\bf 364}, 870 (2019)].
Density Matrix Renormalization Group computations, exact diagonalization, and
instanton theory provide a consistent description of this very strongly
interacting system, and show good agreement with experiments. Experimentally
extracted and theoretically computed tunneling amplitudes exhibit a scaling
collapse. Collective quantum fluctuations renormalize the tunneling, and
substantially enhance it as the number of electrons increases.
