No harm and in this case it was probably perfectly safe but that's not my point. Some people think scuba diving is something that should be taken seriously. Do you feel walking on the bottom demonstrates that you are taking it seriously?
I've seen two other people walking on the bottom (or ceiling). One was a cave diver, I use that term liberally. He decided to try and walk on the ceiling of a high-flow cave. He obviously had to inflate his wing quite a bit to do this. Well the flow caught him and blew him out of the cave (from 50' deep). Those on the surface said he looked like a Polaris missile. Fortunately he was in the beginning of his dive so DCS wasn't an issue but he's lucky he didn't embolize. The second time was in basin and some OW divers were screwing around walking on the bottom. Of course they didn't realize the crap they were kicking up was getting sucked into the cave and would have blown out the viz for anyone in there (which can be quite dangerous).
IMHO scuba diving requires some respect for the dangers of your environment and doing things like walking on the bottom demonstrates that you don't have that respect.
My issue with the original poster and your profile photo is not one of safety or damage to the environment but rather an issue of attitude.
I've seen two other people walking on the bottom (or ceiling). One was a cave diver, I use that term liberally. He decided to try and walk on the ceiling of a high-flow cave. He obviously had to inflate his wing quite a bit to do this. Well the flow caught him and blew him out of the cave (from 50' deep). Those on the surface said he looked like a Polaris missile. Fortunately he was in the beginning of his dive so DCS wasn't an issue but he's lucky he didn't embolize. The second time was in basin and some OW divers were screwing around walking on the bottom. Of course they didn't realize the crap they were kicking up was getting sucked into the cave and would have blown out the viz for anyone in there (which can be quite dangerous).
IMHO scuba diving requires some respect for the dangers of your environment and doing things like walking on the bottom demonstrates that you don't have that respect.
My issue with the original poster and your profile photo is not one of safety or damage to the environment but rather an issue of attitude.