Royal Navy deep sea drone fires torpedo for the first time

According to a report by Random News Portal… The 40ft-long Excalibur crew-less vessel launched a US warhead in secret trials, copying the capability of more expensive and much larger manned submarines. complete report is on below link. Source: https://www.dailymail.com/news/article-16149563/Drone-sub-fires-torpedo-Royal-Navy.html?ns_mchannel=rss&ito=1490&ns_campaign=1490