I've been to the U-352; Trip Report - Morehead City, NC August 2015 -
http://www.scubaboard.com/forums/no...us-dive-center-aug-9-13-2015-trip-report.html
I don't know whether you've dove North Carolina's off-shore wrecks before. In case you haven't, for off-shore North Carolina diving, generalizing off-the-top-of-my-head from that trip...about 1 1/2 hours from dock to 1st dive site, wreck diving not reef, flat sandy bottom might be 110 feet deep, the popular 'house mix' of nitrox was EAN 30%, and with Olympus Dive Center I rented a pair of steel 120-cf tanks, dives can be somewhat 'square profile' and tended to run around 35 minutes or so including safety stop, and were NDL-limited rather than gas-limited for me.
Good diving. Didn't see sand tiger sharks on the U-352, but saw when on the
Caribbsea and inside the
Aeolus (in the 'shark room' that's got a wall open to the outside). Inshore wrecks were faster to get to, shallower, cooler and lower viz., and I didn't see sharks on them, but they were still good (and longer!) dives.
Richard.