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In this talk, I will first briefly review the false vacuum decay in flat space using the semiclassical approximation. In particular, the typical false vacuum decay follows the so-called Coleman conditions, i.e. the instanton is regular at the center of the bubble, and the solution is O(4) symmetric. It was proven that such an instanton leads to the lowest bounce action; therefore, its corresponding decay process is the most probable. Then, I will explain the possibilities of extending such a situation to the case where the O(4)-symmetric instanton is singular, provided that the action is still finite. Additionally, I will provide a concrete example, in which this situation can be realized and show the analysis of the non-trivial anisotropic deformations around such a singular instanton within perturbative regime. Interestingly, in our example the total action is given by that evaluated on the O(4)-symmetric solutions, even if one takes into account the small and regular deformations. Our result suggests that there are many non O(4)-symmetric solutions with finite action beyond Coleman's theorem.