Slave Cave Image & Tour

This is a much better shot of the natural slave cave in Zanzibar. I couldn't capture the coral walls well with my camera.

Taken from http://www.luxnet.at/gallery/v/Africa2004/tz-zanzibar-02.jpeg.html
 
Here is a link to a tour:
http://www.youtube.com/watch?v=lIgsviK7ed8