So, I have a theory regarding Toa Canisters. I'm not sure about the probability of this theory, however, I'll leave that to be discussed. My theory is this; That Toa Canisters do not operate normally, but are assisted by the systems of the Mata Nui robot. My reason for believing this to be a possibility; They tunnel straight throught solid rock and such and force their way straigth through anthing that stands between them and their destinations, and we see little other technology in the MU that can match the Toa Canisters in their ability to break through numerous types of substances. I suggest that Toa Canisters have (a) piece(s) in them that connect to the system of the MU, and the MU helps them break through surfaces and reach their destination, and that only the matoran who build the Canisters know about this, if they even do at all.