[calcifer]

> I wonder what are options to commute other than by walking, cycling or taking a public transport?

Honestly that sounds a bit like "what are my options for breathing other than using my nose or my mouth?".

[uniformlyrandom]

That is s a good interview question. Gills? Direct oxygen injection?

[scarejunba]

A big problem is removing the CO2 (or you get acidosis) but how about "heavy pump attached to perfluorocarbon liquid with high oxygen content through hole in chest into lung"?