North Solitary Island's Grey Nurse Gutters are a series of channels cut into the island's reef, functionally similar to the better-known Shark Gutters at South Solitary Island but sitting in a far more remote and lightly dived part of the marine park, reachable only via the 75-minute run from Wooli. The gutters run through typical Solitary Islands rock terrain in roughly 10 to 22 m, providing the current shelter that grey nurse sharks favour when resting during the day. Because North Solitary Island receives a fraction of the diver traffic that South Solitary Island sees from the much larger Coffs Harbour operator, sharks using these gutters tend to be less habituated to divers and correspondingly more easily disturbed, making a slow, low, non-confrontational approach even more important here than at the busier southern site.

Wobbegong sharks, turtles and typical Solitary Islands reef fish share the gutters with the resting grey nurse sharks, and the site's isolation means encounters here feel considerably more solitary and unhurried than at the marquee South Solitary Island sites. As with the rest of North Solitary Island, a visit to Grey Nurse Gutters depends on a settled weather window and Wooli Dive Centre's minimum group size requirement for the longer trips, and the site is generally worked into a broader day alongside Anemone Bay and Fish Soup rather than targeted as a stand-alone destination. For divers who have already done the more accessible grey nurse shark dives further south and want a quieter, more remote encounter, this is a worthwhile if logistically demanding option.

Wooli Dive Centre departs from the Wooli River wharf; the river mouth has a shallow, shifting bar that the operator's purpose-built jet-propulsion vessel is equipped to cross. Trips to North Solitary Island run about 75 minutes each way, weather dependent, with a minimum group size typically required.

North Solitary Island sits fully in the open ocean and trips depend on a genuinely settled weather window; the Wooli River bar can be dangerous in a big swell or strong outgoing tide. Visibility is normally excellent (15-30 m). Winter is cooler but often calmer; summer brings warmer water and more current.

Descend into the gutter system at 10-14 m, move slowly and low to avoid disturbing resting sharks, and work the deeper sections to 20-22 m before ascending along the gutter wall.

Wooli Dive Centre includes Grey Nurse Gutters on North Solitary Island itineraries when sea conditions and the day's shark movements suit.