CNN CNN Newsroom April 17, 2014 18:08:00
You are -- how quickly stuff can disappear in the gloom. so, in other words, you could be down at that depth and you are going need light. it is absolutely pitch black. and, yet, if you are not within -- i don't know, nine feet, maybe six feet of something out there from the human eye point of viewer, you are not going to see it rushgs? >> depends entirely on the visibility on the bottom. visibility could range anywhere from just a few pete as we have here to a much better range. you can't defend on it. you go one day you are down and you see wells and the -- >> we have a little demo we can do...
Source: archive.org