Douglas is the only Manx port with dedicated passenger handling facilities and roll-on roll-off vehicle services. The port provides specialist berths for oil and gas tankers as well as general cargo vessels, fishing vessels and occasional survey, customs and naval vessels. The Isle of Man's first marina was opened during 2001 and offers a limited number of berths for visiting leisure craft, subject to availability. A second phase of pontoons was completed in the autumn 2006. Substantial ongoing investment is continuing to further enhance the harbour's facilities. A private towage service is available and a commercial inshore passenger ferry operates various services throughout the summer season to other ports.