The paper talks about how they can get it to work in a narrow 1MHz band (though at full 1MBbit/sec speeds I am skeptical of course), but even then I'm strugglin

The paper talks about how they can get it to work in a narrow 1MHz band (though at full 1MBbit/sec speeds I am skeptical of course), but even then I'm struggling to imagine fitting the number of people on that beach into channels that isn't a disaster. Strange to not address it... Maybe if they formed a mesh network that prioritized signals of a certain power level and had dynamic power levels to avoid losing touch with the mesh while avoiding blocking close + strong signals.