It’s also important to know that there is no difference between hard ceilings (caves, wrecks, etc) and artificial/decompression ceilings if you are doing that t

It’s also important to know that there is no difference between hard ceilings (caves, wrecks, etc) and artificial/decompression ceilings if you are doing that type of dive profile. Most of those dives will be 3 or more tanks or rebreathers though.