Flooded passage in Ingleborough Cave, Yorkshire Dales, UK (photo: John Cordingley) Side passage tube, Hang Phong Nha, Quang Binh, Vietnam (photo: Howard Limbert)

DOI link for Flooded passage in Ingleborough Cave, Yorkshire Dales, UK (photo: John Cordingley) Side passage tube, Hang Phong Nha, Quang Binh, Vietnam (photo: Howard Limbert)

Flooded passage in Ingleborough Cave, Yorkshire Dales, UK (photo: John Cordingley) Side passage tube, Hang Phong Nha, Quang Binh, Vietnam (photo: Howard Limbert) book