Phong Nha Underground LTD Address: DT20 Street, Xuan Tien Hamlet, Son Trach Commune, Bo Trach District, Quang Binh Province Enterprise code: 3101048074 Phone: 0935392792 Representative: Nguyen Thi Hong Loan Son Trach Commune, Bo Trach District, Quang Binh ProvinceFounding date: 28 - 3 - 2018