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Enormous Ly$\alpha$ nebulae (ELANe) represent the extrema of Ly$\alpha$nebulosities. They have detected extents of $>200$ kpc in Ly$\alpha$ andLy$\alpha$ luminosities $>10^{44}$ erg s$^{-1}$. The ELAN population is anideal laboratory to study the interactions between galaxies and theintergalactic/circumgalactic medium (IGM/CGM) given their brightness and sizes.The current sample size of ELANe is still very small, and the few $z\approx2$ELANe discovered to date are all associated with local overdensities of activegalactic nuclei (AGNs). Inspired by these results, we have initiated a surveyof ELANe associated with QSO pairs using the Palomar and Keck Cosmic WebImagers (PCWI/KCWI). In this letter, we present our first result: the discoveryof ELAN0101+0201 associated with a QSO pair at $z=2.45$. Our PCWI discoverydata shows that, above a 2-$\sigma$ surface brightness of $1.2\times10^{-17}$\sbunit, the end-to-end size of ELAN0101+0201 is $\gtrsim 232$ kpc. We haveconducted follow-up observations using KCWI, resolving multiple Ly$\alpha$emitting sources within the rectangular field-of-view of $\approx 130\times165$projected kpc$^2$, and obtaining their emission line profiles at highsignal-to-noise ratios. Combining both KCWI and PCWI, our observations confirmthat ELAN0101+0201 resides in an extremely overdense environment. Ourobservations further support that a large amount of cool ($T\sim10^4$K) gascould exist in massive halos (M$\gtrsim10^{13}$M$_\odot$) at $z\approx2$.Future observations on a larger sample of similar systems will providestatistics of how cool gas is distributed in massive overdensities athigh-redshift and strongly constrain the evolution of the intracluster medium(ICM).

Keck/Palomar Cosmic Web Imagers (KCWI/PCWI) Reveal an Enormous Ly$\alpha$ Nebula in an Extremely Overdense QSO Pair Field at $z=2.45$