I believe there has been some confusion. On the pages HYDRA Head 3, HYDRA Head 4, HYDRA Head 5 and HYDRA Head 6, edits were made by you, Nerdtastic and a few others stating that these HYDRA heads were alive. However, throughout Season 3 Episode 19, it is stated that the Destruction of HYDRA left only Kirk Vogel, HYDRA Head 1 and HYDRA Head 2 alive and we see the bombing itself in Season 3 Episode 17. This is why those three were the only people present when Radcliffe performed his experiment. Just wanted to clear that up.