They're great posters. I do not have copies in my humble collection, but would probably bid on them if I saw them. On the Revolution poster, the baobab tree is remarkable, in itself, and the overall design is pretty rad.
Rob and his dive buddy were diving pretty deep, 225 feet, and it was their third dive. They were also using rebreathers, which combined with multiple dives that deep, makes the diving even more complicated. Rob's buddy allegedly passed out at the surface and the boat was picking him up when they saw Rob surface, but did not get to him in time. It's possible that he also passed out. Very unfortunate turn of events.