The main purpose of this work is to build classically stationary bubbles,within the thin-shell formalism, which are unstable under quantum effects; theyeither collapse into a black hole or expand. Thus, the final state can bethought of a superposition of geometries. We point out that, from a quantummechanical point of view, there is no issue with a loss of information in suchconfiguration. A classical observer sees a definite geometry and, hence, findsan effective loss of information. Although it does not cover all possiblecases, we emphasise the role of semi-classical gravitational effects, mediatedby instatons, in alleviating/solving the information loss paradox.
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