This mountain island is said to contain caves which extend some distance beneath the surrounding waters, but which are nevertheless perfectly dry.
"Due North or Glimpses of Scandinavia and Russia"
Maturin M. Ballou
It is in such regions, accordingly, where we meet with the most striking examples of caves and underground river-channels.
"Geology"
James Geikie
Getting out into the light at last, they proceeded with their search for the smugglers, resolving not to enter any more mysterious caves, but to look for places where a vessel might be able to hide.
"The Hilltop Boys on Lost Island"
Cyril Burleigh