From memory I think the first picture came about with a nurse shark well secured under the ledge, I had a quick look then backed out following which the picture took place...
No, that's not me with the turtle, but I have to say it did seem totally unphased by the group.
Just after this as I was hanging watching it swam towards me then lodged itself against me (sort of chest to chest) with its face right in mine and stayed there for what seemed ages (probabnly 15- 20 seconds)!!
I was amazed to the extent my buoyancy suffered somewhat
but it was an experience I'll never forget.