[Air-L] The distribution of international Internet bandwidth between terrestrial (overland) cable and maritime cable?

[Han-Teng Liao (OII)]

Dear all,
   How much of the Internet is carried across oceans versus overland?  I
know it can have different answers, depending on the definition of actual
traffic, bandwidth capacity, etc.  Still, I just want to know *roughly* how
much of the Internet is maritime and continental.  Any educated or wild
guess is welcome.
Best regards,
hanteng