This proved highly dangerous to pilgrims who approached the abbey across the sands (the causeway joining the island to the mainland was not built until 1874).
The bridge that connects the island to the mainland was built in 1822.
mnli hypothesis: The bridge that connects the island to the mainland was built in 1822. premise: This proved highly dangerous to pilgrims who approached the abbey across the sands (the causeway joining the island to the mainland was not built until 1874).