The data-rate would be far below 1 bps. The event-rate in SuperK [1] from the Sun was ~0.1/day/kiloton of water. Signalling to submarines would require a Ferm

The data-rate would be far below 1 bps. The event-rate in SuperK [1] from the Sun was ~0.1/day/kiloton of water. Signalling to submarines would require a Fermilab or T2K-caliber accelerator with an ability to direct a beam, with a properly-oriented pion-decay hall, generally in the known direction of the submarine and highly-synchronized clocks (or a clever time-structure strategy) to allow coincidence-detection for background-suppression. For scale, the MINOS detector [2] detected a couple thousand events with a couple of years of beam-time. [1] https://en.wikipedia.org/wiki/Super-Kamiokande#/media/File:Neutrino_Flus_distribution.gif https://en.wikipedia.org/wiki/Super-Kamiokande#/media/File:N... [2] https://arxiv.org/pdf/1103.0340.pdf https://arxiv.org/pdf/1103.0340.pdf