Underwater Writing, AI Consciousness, and Lasers in Space

I went to the Smithsonian Institute of Air and Space on a group excursion when I was 15 and bought one of those 'space pens'. I wonder if anyone ever tried to use one of them underwater.

The writing underwater per se is not new, see using the link below various ways of writing during dives, including paper and pencil. I suppose that the news here is that this ink Sabine is writing (above water) here is one that can be used to write on coral, or stone, or on the side of the Titanic. See: https://www.scuba.com/blog/underwater-writing-devices/ The idea of using laser beams to communicate, one-way or two-way as needed: data, telemetry, messages, etc. between spacecraft and spacecraft or spacecraft to ground stations and vice versa has been tested several times. This one between the International Space Station and multiple ground facilities can be valuable, near-term, to the work at the ISS; beyond that, who knows. This reminds me of something that was attempted years ago, to synchronize very precisely the atomic clocks of a network used to produce a very precise time measurement, for example to maintain Temps Atomic International (TAI) and UTC. The test would have used a satellite called LAGEOS, a ball with a core of depleted uranium (meant, along with its high altitude, to reduce air drag) and covered in corner-cube retroreflectors (to track precisely its orbit using ground-based lasers) intended to study the Earth's gravity field from the departures of this orbit from a purely Keplerian one, for geophysical research. So the idea was to bounce laser beams, carrying the respective clocks' time signals, off this satellite , two-way between two ground stations also with atomic clocks. As the difference between the transmitted and received signals was that of the two clocks time discrepancy, plus the travel time at the speed of light, plus the unknown delays in the atmosphere, measuring this difference would give the clocks' discrepancy and remove those common delays. This is known as "time transfer", and is routinely made on the ground using regular communication means, such as radio and cables. There have also been tests of quantum encrypted laser communications ground-to-satellite: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.040502 As to how brains function and the philosophy of things mental, I leave the floor to someone who may know something about that. I now something about neural networks, but not about their epiphenomena, real or not (and these "AI" networks are totally deterministic!)