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A paper by Su et al (2013)[1] is focused on the presentation of \b{eta}-MnO2(pyrolusite) as a new high-capacity electrode for Na batteries, arguing thatthere is plenty of place in the tunnels to host sodium, which is clearlycontrary to general knowledge. Similar imprecisions are found in other work sothat it might be useful to shortly address the issue of cavities and tunnels ina general way. Here, two structures of the octahedral molecular sieve group(\b{eta}-MnO2 pyrolusite and {\alpha}-MnO2 hollandite) are taken as an exampleand analysed at some depth regarding their tunnel structure using advancedsoftware. Tunnels and their occupation are of fundamental importance for theapplication of such materials as electrodes or in strongly correlated electronsystems.

What is a tunnel? A comment on frequent imprecision when speaking about  tunnels, at the example of two representative structures in the octahedral  molecular sieve group