Two cents: Probably shattered in a dozen pieces, falling for a long distance, well scattered, and probaly also opticallly invisible. (That's another two cents.)
Best hurry-up guesses of refractive indices:
Seawater 1.33-1.34 best guess
Teflon ("plastics?") 1.315
These numbers vary a bit depending on a lot of things like light frequency, temperature, blah-blah-blah, but you can see that even with the port still in one piece, it would be hard to detect.
I should be charging five cents for that.
Sort of like looking at one of those "puree" marbles in a glass of water. (For those of us who used to shoot marbles.)
Terry, 230RN