I had the opportunity recently to scuba dive the Silfra Fissure in Iceland! This was a bucket-list item for me, and many divers like me!  

300+ feet of visibility and the sensation of floating in a water as clear as air was almost dizzying. 

The pictures, while spectacular, don't do it justice. It was a once in a lifetime experience! 

In the image above I am touching the North American and Eurasian tectonic plates simultaneously.