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We present APEX, infrared and radio continuum observations of theG345.88-1.10 hub filament system which is a newly discovered star-forming cloudthat hosts an unusually bright bipolar infrared nebulosity at its centre. At adistance of 2.26$^{+0.30}_{-0.21}$ kpc, G345.88-1.10 exhibits a network ofparsec-long converging filaments. At the junction of these filaments lie fourinfrared-quiet fragments. The densest fragment (with M=210 M$_{\odot}$,R$_{\rm{eff}}=0.14$ pc) sits at the centre of a wide (opening angle of $\sim$90$\pm$15$^{o}$) bipolar nebulosity. $^{12}$CO(2-1) observations show thatthese infrared-bright nebulosities are spatially associated with a powerfulmolecular outflow from the central fragment. Negligible radio continuum and noH30$\alpha$ emission is detected towards the cavities, seemingly excluding thationising radiation drives the evolution of the cavities. Furthermore, radiativetransfer simulations are unable to reproduce the observed combination of alow-luminosity ($\lesssim$ 500 L$_{\odot}$) central source and a surroundinghigh-luminosity ($\sim 4000$ L$_{\odot}$) mid-infrared-bright bipolar cavity.This suggests that radiative heating from a central protostar cannot beresponsible for the illumination of the outflow cavities. To our knowledge,this is the first reported object of this type. The rarity of objects likeG345.88-1.10 is likely related to a very short phase in the massive star and/orcluster formation process that was so far unidentified. We discuss whethermechanical energy deposition by one episode or successive episodes of powerfulmass accretion in a collapsing hub might explain the observations. Whilepromising in some aspects, a fully coherent scenario that explains the presenceof a luminous bipolar cavity centred on an infrared-dark fragment remainselusive at this point.

A new phase of massive star formation? A luminous outflow cavity centred on an infrared quiet core