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The Zeelandbrug is a five-kilometre bridge spanning the Oosterschelde estuary in the southwestern Netherlands, connecting the islands of Noord-Beveland and Schouwen-Duiveland. The bridge's concrete pillars extend to the estuary floor at depths up to 28 metres, and over decades they have become heavily colonised by marine life. The pillars create artificial reef habitat in an otherwise sandy estuary, concentrating marine life and providing protection from tidal currents. The shore access from the parking area at the bridge's southern end makes it one of the most accessible deeper dives in the Benelux region.

Cuttlefish are present from March through June, with peak mating and egg-laying activity in April and May. During this period, dozens of cuttlefish can be observed on a single dive, displaying courtship behaviour, competing for mates, and laying eggs on structures near the bridge pillars. The cuttlefish are remarkably tolerant of diver presence during breeding and allow very close observation. After June, the adults die after spawning and juveniles hatch throughout the summer, visible as tiny replicas of the adults.

Tidal currents at the Zeelandbrug can be extremely strong, making dive timing critical. Diving is only safe during slack tide periods, which last approximately 30 to 45 minutes. Divers must consult tide tables and plan entries precisely around slack water. The bridge pillars themselves provide shelter from current, and experienced divers can extend dive times by remaining close to the pillars. During maximum tidal flow, currents can exceed three knots, which is far too strong for safe diving. Local dive shops provide current predictions and advice.