Thanks for the clairification and everyone's information
Here's a photo of the blue ring that started this thread:
When we muck dive we're sure to not touch the bottom, although when we are teaching we often have no choice (well the choice is sit on the bottom or lose the students)
Here's a photo of the blue ring that started this thread:
When we muck dive we're sure to not touch the bottom, although when we are teaching we often have no choice (well the choice is sit on the bottom or lose the students)