I was roaming around on the net today when I saw the new video clip for Soaked. Well it looks like their adding tunnels again to vertical slopes and underwater tunneling. I am still amazed by the waterfall option and I hope it is useable. I think RTC series really needs this step to help themselves it is a good step towards progress, I think. I do apologies if this was already listed just ignore it if it is. The link below should take you there.
http://media.pc.ign.com/media/728/728622/vids_1.html