Excalibur is introduced as a 12-metre Royal Navy experimental uncrewed submarine tested in Australia. A successful trial establishes useful experience with one vehicle. Communicating with submerged craft still depends on specialized infrastructure such as very low frequency and extremely low frequency systems. Only a limited set of states is listed as possessing those facilities, and reliable control remains a separate question.
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Communications constrain uncrewed undersea warfare
Excalibur's Australian trial introduces the limited infrastructure available for communicating with submerged vehicles.