  Despite extensive experimental efforts over the past two decades, the quest
for Majorana fermions in superconductors remains inconclusive. We propose an
experimental method that can conclusively confirm, or rule out, the existence
of these quasiparticles: Firstly, we shift focus from superconductors, whose
very topological nature is disputed, to the unambiguous topological superfluid
$^3$He. Secondly, we identify the interaction between surface waves and the
chiral Majorana current in the bulk of a topological superfluid of varying
density. The proposed experiment provides a path towards the detection of the
Majorana fermion, an 80-year-old theoretical prediction. It is realistically
achievable based on the advent of microscopic superfluid resonators coupled to
optical cavities. The proposal may open the door to experiments ranging from
simulations of exotic cosmological particles to topological acoustics and fault
tolerant quantum computing.
