Set into the shape of the southern sea facing fortifications of the Royal Citadel is the world-renowned Plymouth Marine Laboratory and below and to the east, perched on the rocky foreshore is the clubhouse of the Royal Plymouth Corinthian Yacht Club.
Set into the shape of the southern sea facing fortifications of the Royal Citadel is the Citadel Hill Laboratory of the Marine Biological Association of the UK, which also houses the Sir Alister Hardy Foundation for Ocean Science. Below and to the east, perched on the rocky foreshore is the clubhouse of the Royal Plymouth Corinthian Yacht Club.