Mckenzie Pier is situated off Newry Promenade, Holyhead. The L-shaped pier juts into the outer harbour and is occasionally used by small boat traffic. Entry is via a set of stone steps set into the outside of the pier wall. Keep the wall on your left and complete three sides of the pier. On the fourth side is another set of stone steps to exit. If dived during the day SMBs are essential. Get permission from the harbour master before diving within Holyhead Harbour. www.diveanglesey.co.uk