The Rebreather Forum 4 Proceedings have been released, but several rebreathers were accidentally left out in a previous paper. Michael Menduno, the author, acknowledged this mistake after being informed by Bretislav Vaisar, CEO of iQsub Technologies. The updated list includes new models like the Hammerhead Classic and Extreme, as well as iQsub’s sidemount rebreathers. It also clarifies that some older models and modified military units were not included in the final listings.