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Galactic archeology based on star counts is instrumental to reconstruct thepast mass assembly of Local Group galaxies. The development of new observingtechniques and data-reduction, coupled with the use of sensitive large field ofview cameras, now allows us to pursue this technique in more distant galaxiesexploiting their diffuse low surface brightness (LSB) light. As part of theAtlas3D project, we have obtained with the MegaCam camera at the Canada-FranceHawaii Telescope extremely deep, multi--band, images of nearby early-typegalaxies. We present here a catalog of 92 galaxies from the Atlas3D sample,that are located in low to medium density environments. The observing strategyand data reduction pipeline, that achieve a gain of several magnitudes in thelimiting surface brightness with respect to classical imaging surveys, arepresented. The size and depth of the survey is compared to other recent deepimaging projects. The paper highlights the capability of LSB--optimized surveysat detecting new prominent structures that change the apparent morphology ofgalaxies. The intrinsic limitations of deep imaging observations are alsodiscussed, among those, the contamination of the stellar halos of galaxies byextended ghost reflections, and the cirrus emission from Galactic dust. Thedetection and systematic census of fine structures that trace the present andpast mass assembly of ETGs is one of the prime goals of the project. We providespecific examples of each type of observed structures -- tidal tails, stellarstreams and shells --, and explain how they were identified and classified. Wegive an overview of the initial results. The detailed statistical analysis willbe presented in future papers.

The Atlas3D project -- XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images