CO(2−1) emission toward DarkPK (black contours at levels 0.5, 1.0, 3.0, and 6.0 K kms⁻¹) superimposed to the Spitzer 8 µm, MCELS Hα, Herschel 160 µm, and AzTEC 1.1 mm maps. The evolutionary classification of YSOs from Sewiło et al. (2013) is indicated by red (Stage I) and green (Stage II) circles. The sizes of these circles are proportional to the stellar luminosity. The yellow box in the 8 µm map indicates the regions where CO emission was detected with ALMA by Jameson et al. (2018).