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In the low-redshift universe comma a fraction of the baryons remains unaccounted for on the largest scales and on the galaxy scales comma which define the global and local missing baryon problems. A promising approach to resolve these problems is to probe X-ray absorption lines imprinted on the spectrum of background quasars. By utilizing our novel stacking method comma we detected an OVII absorption line in the spectrum of PKS0405-123. We propose deep XMM-Newton observations that will boost the stacked exposure time to 10.4 Ms comma allowing us to probe the absorption lines to unprecedented depths. We will demonstrate the robust nature of the detection comma increase its significance to >5sigma comma and build an accurate gas density profile comma thereby addressing the global and the local missing baryon problems.