There apparently are models that do have somewhat of a periscope/snorkel/apparatus and are capable of some submersion ... Apparently, the 'very shallow and thi

There apparently are models that do have somewhat of a periscope/snorkel/apparatus and are capable of some submersion ... Apparently, the 'very shallow and thin' model is good enough to not get caught, without having to dive (heh) into the complexities associated with submersion.-