I gave a talk on unobtrusive viewing and optical luring of deep sea squid in which I emphasized the importance of using quiet, unobtrusive platforms for exploration.

And we view it with a camera system I developed called Eye in the Sea that uses far red light that's invisible to most animals, so it's unobtrusive.

When I'm sitting in a submersible though, I know that I'm not unobtrusive at all I've got bright lights and noisy thrusters any animal with any sense is going to be long gone.

Augmenting an FCL for countries with impeccably strong policies with a PCL for countries with reasonably strong policies might break this deadlock. Countries qualifying for a PCL would have to meet some, but relatively minimal and unobtrusive, conditions.