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The alignment of the CMB Cold Spot and the Eridanus supervoid suggests aphysical connection between these two relatively rare objects. We use galaxycata\-logues with photometric (2MPZ) and spectroscopic (6dF) redshiftmeasurements, supplemented by low-redshift compilations of cosmic voids, inorder to improve the 3D mapping of the matter density in the Eridanusconstellation. We find evidence for a supervoid with a significant elongationin the line-of-sight, effectively spanning the total redshift range $z<0.3$.Our tomographic imaging reveals important substructure in the Eridanussupervoid, with a potential interpretation of a long, fully connected system ofvoids. We improve the analysis by extending the line-of-sight measurements intothe antipodal direction that interestingly crosses the Northern Local Supervoidat the lowest redshifts. Then it intersects very rich superclusters likeHercules and Corona Borealis, in the region of the Coma and Sloan Great Walls,as a possible compensation for the large-scale matter deficit of Eridanus. Wefind that large-scale structure measurements are consistent with a centralmatter underdensity $\delta_0 \approx -0.25$, projected transverse radius$r_{0}^{\perp}\approx 195$ Mpc/h with an extra deepening in the centre, andline-of-sight radius $r_{0}^{\parallel}\approx500$ Mpc/h, i.e. an ellipsoidalsupervoid. The expected integrated Sachs-Wolfe imprint of such an elongatedsupervoid is at the $\Delta T_{\rm ISW} \approx -40 \mu K$ level, thusinappropriate to accounting for the Cold Spot pattern in the CMB.

Cosmic troublemakers: the Cold Spot, the Eridanus Supervoid, and the Great Walls