okay so re: lobster immortality there's got to be a way to crack this. like, they've done half the work already, yeah? they don't age, they grow until they are no longer able to muster the energy to shed.
i see three issues. the first is the square-cube law. proportional growth becomes exponential for volume and surface area. if allowed to grow indefinitely, a lobster will quickly find itself overly burdened by gravity. this can be fixed by launching it into space. an orbital aquarium, perhaps lunar as a temporary measure.
secondly, as the creature grows larger, it will likely require more nutrients than it can feasibly absorb. this is easibly fixable through cybernetic implants, adding new methods of intaking nourishment as necessary.
and finally, the molting. the thing is that you can't just, like, help it molt when it can't do it by itself. it has to initiate the process, form an exoskeleton under its current one, or breaking its shell will kill it. you have to make its metabolism think it has enough energy to molt, then provide at least enough energy for it to actually manage the first part while you handle the second. the solution here is obviously cocaine. or the lobster equivalent of cocaine.
of course, a lobster under these conditions would still very likely take hundreds of years to grow. it would not be a project a single human could see through. unless they did something crazy like transfer their consciousness into the lobster's brain. but that's veering just a bit too far into the hypothetical.
so what i'm saying is that a cocaine-fueled cyborg titan lobster deployable from orbit may not be a benefit of being a marine biologist, but it *may* be a benefit of being a marine biologist's great-great-great-great-great-grandchild.