I don't think I was that far off JB, please feel free to correct me.

The SHARC™ Harvester (US Patent No. 8,096,334) is a versatile underwater logging system capable of harvesting trees in shallower reservoirs (<40m) where production and maneuverability are critical.

Tygerlink AR-120

"Fully command 2 ¾ Ton payloads at depths up to 136 feet using Tiger Link's breakthrough Robotic Manipulator Technology. "

The Sawfish™ Harvester (US Patent No. 6,789,587) was designed by Triton specifically for deep-water reservoirs (>40m) where divers and surface-mounted systems cannot safely or effectively operate.