There are calls to upgrade Australia's ageing Collins class submarines amid rising tensions with China. (Royal Australian Navy)(Supplied) The Collins vessels are scheduled to end their service by 2026, while the first of Australia's 12 new Attack-class submarines is not expected to be delivered until about 2035 - potentially leaving the Australian Defence Force without submarines for years. Despite costs blowing out to almost $90 billion, the French-designed vessels - being built under the Future Submarines Program - remain in the design stage. The Federal Government said about 4000 jobs in A...