A spacetime endowed with an anisotropic fluid is proposed for the interior of a black hole. The geometry has an instantaneous Minkowski form and is a solution of Einstein's equations with a stress tensor on the r.h.s. obeying all the energy conditions. The interior fluid is compressible, with time dependent shear and bulk viscosity coefficients. The energy density __ and the "radial" pressure p are proportional to 1/t~2, with no pressures on ___ and ___ directions. The model leads to a time dependent cosmological constant.
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