The 700 ks <i>Chandra</i> Spiderweb Field

(Abridged) We present an analysis of the 700 ks Chandra ACIS-S observation field around Spiderweb Galaxy at z=2.156, focusing on nuclear activity in associated large-scale environment. identify unresolved X-ray sources down to flux limits 1.3X10^{-16} and 3.9X10^{-16} erg/s/cm^2 soft hard band, respectively. search for counterparts optical, NIR submm bands belonging protocluster. detect 107 within 5 arcmin (corresponding 2.5 Mpc) J1140-2629, among which 13 have optical with spectroscopic redshift 2.11~1.84+-0.04. The best-fit absorption protocluster members N_H>10^{23} cm^{-2}, while other 6 upper order fewX10^{22} cm^{-2}. Two can only be fitted very flat \Gamma<=1, are therefore considered Compton-thick candidates. Their 0.5-10 keV rest frame luminosities larger than 2X10^{43} erg/s, significantly greater expected from star formation activity. luminosity function AGN volume range 10^{43}10.5, corresponding enhancement 6.0^{+9.0}_{-3.0} respect COSMOS comparable redshifts conclude galaxy population Protocluster characterized by enhanced triggered environmental effects Mpc scales.