Abstract
We give an update on our comprehensive gas surveys of some of the most luminous Lbol > 105 to 107 L⊙ deeply embedded - optically obscured - star formation regions in the Milky Way, which are the local cases of massive star clusters and/or associations in the making. Our approach emphasizes multi-scale, multi-resolution imaging in dust and gas in its different phases through a combination of data taken with ALMA, JVLA, SMA, Herschel, and single-dish telescopes including the LMT in Mexico.
