Iran cuts 95% of Internet traffic

[surfer at mauigateway.com (Scott Weeks)]

--- sean at donelan.com wrote:
From: Sean Donelan <sean at donelan.com>

Its very practical for a country to cut 95%+ of its Internet connectivity. 
Its not a complete cut-off, there is some limited connectivity. But for 
most ordinary individuals, their communication channels are cut-off.

https://twitter.com/netblocks/status/1196366347938271232
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Does anyone know the network mechanics of how this happens?  For
example, do all fiber connections go through a governmant choke
point for suppression?  If so, what's to stop ubiquity-style 
microwave over the border to sympathetic folks on the other side?  

scott