While it's good to see that Google are taking caving seriously, one may well wonder at the following:
Celebrating Puerto Princesa Underground River
Something strange happens on the Philippine island of Palawan when the Cabayugan River reaches the 1,000-meter (3,280.8-feet) high limestone mountain called Saint Paul . . .
The 24-kilometer (14.9-mile) matrix of caves?including the 360-meter (1181.1-feet) long, 80-meter (262.5-feet) high Italian?s Chamber, one of the largest cave halls in the world . . .