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Extreme emission-line galaxies (EELGs) at redshift z=1-2 provide a uniqueview of metal-poor, starburst sources that are the likely drivers of the cosmicreionization at z$\geq6$. However, the molecular gas reservoirs of EELGs - thefuel for their intense star-formation - remain beyond the reach of currentfacilities. We present ALMA [CII] and PdBI CO(2-1) observations of a z=1.8,strongly lensed EELG SL2S 0217, a bright Lyman-$\alpha$ emitter with ametallicity 0.05 $Z_\odot$. We obtain a tentative (3-4$\sigma$) detection ofthe [CII] line and set an upper limit on the [CII]/SFR ratio of$\leq1\times10^6$ $L_\odot$/($M_\odot$ yr$^{-1}$), based on the synthesizedimages and visibility-plane analysis. The CO(2-1) emission is not detected.Photoionization modelling indicates that up to 80% of the [CII] emissionoriginates from neutral or molecular gas, although we can not rule out that thegas is fully ionized. The very faint [CII] emission is in line with both nearbymetal-poor dwarfs and high-redshift Lyman-$\alpha$ emitters, and predictionsfrom hydrodynamical simulations. However, the [CII] line is 30$\times$ fainterthan predicted by the De Looze et al. [CII]-SFR relation for local dwarfs,illustrating the danger of extrapolating locally-calibrated relations tohigh-redshift, metal-poor galaxies.

Ultra-faint [CII] emission in a redshift = 2 gravitationally-lensed metal-poor dwarf galaxy