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Deep-sea archives all over the world show an enhanced concentration of theradionuclide $^{60}$Fe, isolated in layers dating from about 2.2 Myr ago. Sincethis comparatively long-lived isotope is not naturally produced on Earth, suchan enhancement can only be attributed to extraterrestrial sources, particularlyone or several nearby supernovae in the recent past. It has been speculatedthat these supernovae might have been involved in the formation of the LocalSuperbubble, our Galactic habitat. Here, we summarize our efforts in giving aquantitative evidence for this scenario. Besides analytical calculations, wepresent results from high-resolution hydrodynamical simulations of the LocalSuperbubble and its presumptive neighbor Loop I in different environments,including a self-consistently evolved supernova-driven interstellar medium. Forthe superbubble modeling, the time sequence and locations of the generatingcore-collapse supernova explosions are taken into account, which are derivedfrom the mass spectrum of the perished members of certain, carefullypreselected stellar moving groups. The release and turbulent mixing of$^{60}$Fe is followed via passive scalars, where the yields of the decayingradioisotope were adjusted according to recent stellar evolution calculations.The models are able to reproduce both the timing and the intensity of the$^{60}$Fe excess observed with rather high precision. We close with adiscussion of recent developments and give future perspectives.

A Way Out of the Bubble Trouble? - Upon Reconstructing the Origin of the Local Bubble and Loop I via Radioisotopic Signatures on Earth