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We present VLA and ALMA imaging of the deeply-embedded protostellar clusterNGC6334I from 5 cm to 1.3 mm at angular resolutions as fine as 0.17 (220 AU).The dominant hot core MM1 is resolved into seven components at 1.3 mm,clustered within a radius of 1000 AU. Four of the components have brightnesstemperatures >200 K, radii ~300 AU, minimum luminosities ~10000 Lsun, and mustbe centrally heated. We term this new phenomenon a "hot multi-core". Two ofthese objects also exhibit compact free-free emission at longer wavelengths,consistent with a hypercompact HII region (MM1B) and a jet (MM1D). The spatialkinematics of the water maser emission centered on MM1D are consistent with itbeing the origin of the high-velocity bipolar molecular outflow seen in CO. Theclose proximity of MM1B and MM1D (440~AU) suggests a proto-binary or atransient bound system. Several components of MM1 exhibit steep millimeter SEDsindicative of either unusual dust spectral properties or time variability. Inaddition to resolving MM1 and the other hot core (MM2) into multiplecomponents, we detect five new millimeter and two new centimeter sources. Watermasers are detected for the first time toward MM4A, confirming its membershipin the protocluster. With a 1.3 mm brightness temperature of 97 K coupled witha lack of thermal molecular line emission, MM4A appears to be a highlyoptically-thick 240 Lsun dust core, possibly tracing a transient stage ofmassive protostellar evolution. The nature of the strongest water maser sourceCM2 remains unclear due to its combination of non-thermal radio continuum andlack of dust emission.

The Massive Protostellar Cluster NGC6334I at 220 AU Resolution: Discovery of Further Multiplicity, Diversity and a Hot Multi-Core