Portsmouth's Royal Navy Submarine Museum and Spinnaker Tower have unveiled a joint ticketing venture that will allow entry into both attractions throughout 2012 and 2013.

The inclusive ticket, which also includes a boat connection across Portsmouth Harbour, will enable visitors to visit the tower's Crow's Nest before embarking HMS Alliance.

Bill Sainsbury, marketing manager at the submarine museum, said: "We have combined two excellent visits and experiences for a new day out in Portsmouth Harbour."

The ticket includes a return cruise across the harbour; free coaching parking at the Royal Navy Submarine Museum; and a free hot drinks voucher at Spinnaker Tower's café.