  Searches for dark matter (DM) have not provided any solid evidence for the
existence of weakly interacting massive particles in the GeV-TeV mass range.
Coincidentally, the scale of new physics is being pushed by collider searches
well beyond the TeV domain. This situation strongly motivates the exploration
of DM masses much larger than a TeV. Secluded scenarios contain a natural way
around the unitarity bound on the DM mass, via the early matter domination
induced by the mediator of its interactions with the Standard Model.
High-energy neutrinos constitute one of the very few direct accesses to energy
scales above a few TeV. An indirect search for secluded DM signals has been
performed with the ANTARES neutrino telescope using data from 2007 to 2015.
Upper limits on the DM annihilation cross section for DM masses up to 6 PeV are
presented and discussed.
