Orkahm wasn't rescued by the Toa Metru, and now he suffers for it...
About this creation
When the Visorak took over Metru Nui, some of the matoran pods were cracked open, their inhabitants were eaten, but Orkahm managed to escape from his cocoon before lunchtime.
He was mutated by the venom though, and fell to his bestial side. Years later, Orkahm was catured by the matoran from Mata-Nui. He was imprisoned, because nobody had the heart to kill him. When many of the matoran fled to the Isle of Thorns, he was taken with them, but escaped on board one of the ships and dove overboard. He was never seen again.
I hope this pic'll help you make sense of how he's made. I put the flash on to show some detail there =]
You like it? Comments would be much apprecated y'know.