User blog comment:Sookey5/Annie is Dead/@comment-24930713-20150817212805/@comment-5774380-20150818132147

I was about to comment the same thing. For what we know, Titan Shifters are no different from regular Titans except they can conciously control their abilities. Physically and biologically, they are the same thing, so if a Titan can survive walled for 100 years without sustenance and oxygen, then a Titan Shifter can do it too.