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Dark matter particles with Planck-scale mass ($\simeq10^{19}\text{GeV}/c^2$)arise in well-motivated theories and could be produced by several cosmologicalmechanisms. Using a blind analysis of data collected over a 813 d live timewith DEAP-3600, a 3.3 t single-phase liquid argon-based dark matter experimentat SNOLAB, a search for supermassive dark matter was performed, looking formultiple-scatter signals. No candidate signal events were observed, leading tothe first direct detection constraints on Planck-scale mass dark matter.Leading limits constrain dark matter masses between $8.3\times10^{6}$ and$1.2\times10^{19} \text{GeV}/c^2$, and cross sections for scattering on$^{40}$Ar between $1.0\times10^{-23}$ and $2.4\times10^{-18} \text{cm}^2$.These are used to constrain two composite dark matter models.

First direct detection constraints on Planck-scale mass dark matter with multiple-scatter signatures using the DEAP-3600 detector