Soulo Shell Bombs on FusionFall?

I couldn't find them either, so I found this Fusion Fall Central forum. Somebody said that they are around the chains, but they take a while to re-spawn. He said the best thing to do is to get a group of four and have them all wait around the chains. Then, when they do appear, shoot them. I haven't tried it yet, because I have the chat and buddy list glitch, but I think it works.