Like any irc channel that's not a split off from another well established channel, it'll grow slowly. Different timezones is the bane to having a lot of people on at once, but helps to have some one there at more times. There's a chan for the more technical discussions as well, #Tech_Diver. You can be in as many chans as you want, and all channel names start with a #. With all the thousands of chans on Dalnet, it's amazing there's not been a scuba room, I've searched .
I hope it takes off well, it'll be a great way to keep the interest up in the winter ahead.
Darlene