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Can hard-hat/suit divers get down that far? I would guess the Ortalon and Pidgeon are way too far out of range to offer any help at all.

Atmospheric Diving Suits can go as deep as 2000 feet or 600 meters.

A submarine rescue exercise was completed about 1 month ago.

Sorbet Royal 2005

Lots of info, links .

Fwiw, here's a pic of a Atmospheric Diving Suit.

San Diego, Calif. (May 3, 2005) - Machinist Mate 1st Class Kris Wotzka and Damage Control Man 3rd Class Kenneth McCollum attached to the Deep Submergence Unit at Naval Air Station (NAS) North Island, assist launching Lt. Cmdr. Keith Lehnhardt in an Atmospheric Dive Suit (ADS) into a training pool for evaluation. The primary use of the ADS is for Submarine rescue missions. U.S. Navy photo by Photographer’s Mate 2nd Class Prince Hughes III

Can hard-hat/suit divers get down that far?

I think we're looking at "Newt Suit" diving at those depths. That's a hard-shell, one-atmosphere diving rig. But whatever they do it will be very risky. Whatever has snagged that sub can also entangle any would-be rescuer. This is going to make the recent spacewalk look like a Sunday picnic.