The Tugs in Big Tub Harbour consists of two historic wooden tugboat wrecks resting in shallow freshwater. Located 50 metres from the shore, the site is accessible via a shore entry and is well-suited for beginner divers. The wrecks lie at depths between 5 and 12 metres, with an average depth of 8 metres. Divers typically experience mild currents and visibility ranging from 5 to 15 metres. Water temperatures fluctuate significantly throughout the year, ranging from 1 to 19 degrees Celsius. Due to the location within an active harbour, divers must remain vigilant regarding boat traffic. Facilities at the site include parking, toilets, and changing rooms.

The Anchor is a freshwater wreck and reef site located in Big Tub Harbour, Lake Huron. Divers can explore the structure at depths between 21 and 22 metres. The site offers visibility ranging from 10 to 30 metres and features a mild current, making it suitable for intermediate divers. Shore entry provides straightforward access, with parking and toilets available on site. Due to the nature of the wreck, there is a risk of entanglement; divers should maintain awareness of their positioning. Water temperatures fluctuate significantly throughout the year, ranging from 1 to 19 degrees Celsius, and thermoclines may be present.

Tobermory, located in Ontario's Georgian Bay, provides shore-based reef diving in shallow water. The site is accessible year-round directly from the shore, making it a convenient option for divers who prefer to avoid boat entries. While conditions vary, the site is generally suitable for beginners who can move at their own pace. Divers should wear thick-soled boots to protect their feet from sea urchins during entry. Be aware that moderate currents can occur, and visibility may shift depending on weather and the time of year. The habitat supports a variety of temperate reef fish and invertebrates typical of the region.

Big Tub Lighthouse Point, located in Big Tub Harbour, offers a diverse freshwater dive experience combining wall, reef, and wreck topography. Divers can explore depths ranging from 11 to 23 metres. The site is accessible via both shore and boat, though shore entries require navigating surf and shore breaks. Conditions include mild currents and visibility between 10 and 30 metres, though sharp thermoclines and cold water intrusions can cause rapid temperature drops. Due to frequent charter boat traffic in the harbour, the use of a surface marker buoy is essential. Facilities including parking and toilets are available on site to assist with gear preparation.

The City of Grand Rapids is a shallow shipwreck located in Big Tub Harbour, Canada. Resting in depths between 5 and 7 metres, the site is suitable for beginners and accessible by both shore and boat. Conditions are generally calm with no current, and visibility typically ranges from 5 to 10 metres. The wreck structure is well within reach for snorkellers. Water temperatures vary significantly throughout the year, ranging from 1 degree Celsius in winter to 19 degrees Celsius in August. Species recorded around this area include round goby, snail, small mouth bass, pike, common carp, American crayfish, and lake trout.

The Sweepstakes is a schooner wreck located in Big Tub Harbour, Canada. Sunk in September 1885 after being towed following damage near Cove Island, the vessel remains a notable site for divers and snorkellers. The wreck rests at a depth of 7 metres, with most of the hull, deck, centreboard, windlass, and railing still intact, though a portion of the stern deck has collapsed. Situated 50 metres from shore, the site features mild currents and visibility ranging from 5 to 30 metres. Water temperatures are consistently cold, ranging from 1 to 19C. Divers should be aware of boat traffic and cold water hazards.

Tobermory HBC is a shallow wreck dive located in Big Tub Harbour, Canada. Resting at an average depth of 6 metres, the site is accessible via a shore entry and features mild currents, making it suitable for beginner divers. Visibility is excellent, often reaching 30 metres. The site offers a 40-minute typical dive duration, though divers must remain aware of boat traffic on the surface and potential entanglement hazards within the wreck structure. Water temperatures fluctuate significantly throughout the year, ranging from 2°C to 20°C, with thermoclines common. Thermal protection is required for all dives.

Dunks Bay in Big Tub Harbour provides a sandy beach entry, offering a more accessible alternative to the rocky coves found elsewhere in Fathom Five National Marine Park. This site is suitable for beginner snorkellers due to its shallow nearshore waters. Conditions are generally mild, though the freshwater environment of Georgian Bay remains cold throughout the year, with temperatures ranging from 2C to 20C. A wetsuit is recommended for comfort. Divers and snorkellers should be aware of potential surf and the risks associated with cold water. Parking is available for visitors. Species recorded around this area include round goby, snails, lake trout, American crayfish, pike, common carp, and small mouth bass.