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French Cay is reached by boat from Providenciales, the main tourist island in the Turks and Caicos. The boat ride takes approximately one hour to ninety minutes depending on conditions. Several Providenciales-based dive operators offer French Cay as a full-day trip, typically including two or three wall dives and a surface interval on the boat. The journey crosses open water and can be rough in strong trade winds, so operators may cancel trips during adverse weather. French Cay itself is a protected nature reserve and landing is prohibited without special permission.

Humpback whales migrate through the Columbus Passage, the deep water channel south of French Cay, from January through March. During this period, whales are regularly seen from the surface during dive trips, and their songs can sometimes be heard underwater. Direct whale encounters on dives are rare and unplanned but do occur, particularly at French Cay's deeper wall sections where the wall faces the migration corridor. The Columbus Passage connects the Atlantic to the Caribbean and serves as a major highway for migrating marine mammals.

French Cay's advanced rating reflects several factors. The exposed location means surface conditions can change rapidly, and the boat ride across open water eliminates quick return to shore. Currents along the wall can be strong and unpredictable, particularly where the Columbus Passage funnels water between the Caicos Bank and the deep Atlantic. The wall drops beyond recreational limits immediately, requiring confident depth management. Finally, the remote location means emergency services are distant. However, on calm current days, experienced intermediate divers with good buoyancy skills can enjoy the upper wall sections safely.