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Pre-stellar cores represent the initial conditions of star formation.Although these initial conditions in nearby low-mass star-forming regions havebeen investigated in detail, such initial conditions remain vastly unexploredfor massive star-forming regions. We report the detection of a cluster oflow-mass starless and pre-stellar core candidates in a massive starprotocluster forming cloud, NGC6334S. With the ALMA observations at a$\sim$0.02 pc spatial resolution, we identified 17 low-mass starless corecandidates that do not show any evidence of protostellar activity. Thesecandidates present small velocity dispersions, high fractional abundances ofNH$_{2}$D, high NH$_{3}$ deuterium fractionations, and are completely dark inthe infrared wavelengths from 3.6 up to 70~$\mu$m. Turbulence is significantlydissipated and the gas kinematics are dominated by thermal motions toward thesecandidates. Nine out of the 17 cores are gravitationally bound, and thereforeare identified as pre-stellar core candidates. The embedded cores of NGC6334Sshow a wide diversity in masses and evolutionary stages.

A Low-mass Cold and Quiescent Core Population in a Massive Star Protocluster