Underwater drone?

[Johnsfolly]

1 hour ago, fishinwrench said:

It does take 2 people to operate it.  You gotta have someone feeding it cable.   

That looks a lot cooler shape, easier to use and feed the tether than the ROV submersible that we used when I was in grad school what seems like a 100 years ago. We used that to try and get population estimates for aquatic invertebrates and one grad student used it to spy on fish making babies . Looking into "sneaky males (use to use a different term that is not politically correct)", which were male sunfish that resembled females in size and coloration that would come into the territory of a dominate male when a female came into breed then he would breed along side the two of them. These males were swimming testes for the most part.