The Penghu County Government announced that the natural sea cave (Blue Cave) of Xijiyu is within the scope of the "Penghu South Sea Columnar Basalt Nature Reserve," and entrance without applying for permission will be punished with a set term of imprisonment for a maximum of 5 years according to the law, along with a penalty fine at a maximum of NT$1 million. Moreover, since collapsing incidents easily occur in the natural sea cave (Blue Cave) of Xijiyu, the general public as well as the related business proprietors must obey the regulations in order to maintain travel safety.