That's at low tide. At high tide, just the lighthouse, rising a hundred ten feet straight up out of the ocean...
9 seconds sound clip from the Three Skeleton Key (Escape) classic radio play.
You can hear this line at 00:01:12 in the radio play.
Quote context
[...]
- Tonight, we escape to a lonely lighthouse off the steaming jungle coast of French Guiana...
- And the nightmare world of terror and violence...
- We bring you again in response to hundreds of requests 'Three Skeleton Key' starring Vincent Price.
- And yes, sharks, the big ones, the fifteen-footers.
- Set in the base of the light was a watertight bronze door... and in you went. And up.
[...]