XV Excalibur Royal Navy seeks suppliers for Type 93 uncrewed submarine under AUKUS programme Royal Navy seeks suppliers for Type 93 uncrewed submarine under AUKUS programme Hybrid Navy 13 Oct 2026 Royal Navy steps towards uncrewed undersea warfare with landmark Excalibur torpedo trial Royal Navy steps towards uncrewed undersea warfare with landmark Excalibur torpedo trial Royal Navy 23 Sep 2026 Royal Navy begins sea trials for giant submarine drone XV Excalibur Royal Navy begins sea trials for giant submarine drone XV Excalibur Autonomous systems 3 Jul 2026