As Sweden prepares its bid to join the North Atlantic Treaty Organization (NATO), two Blekinge-class submarines are being built: construction of HMS Blekinge was ordered to Saab in 2015 (first submarines ordered in over 20 years) and can accommodate 26 sailors each, plus autonomous underwater vehicles (AUVs), remotely operated vehicles (ROVs) as well as magnetic silencing facilities (MSF). Thanks to UAVs and ROVs, the submarine can stay away from risky missions while still being able to carry out intelligence, surveillance, and reconnaissance tasks. This submarine can also be armed with torpedoes and mines: Sweden has spent $840 million to improve its submarine designs. The first of the Blekinge-class submarines will be delivered no sooner than 2027, to be followed up by HMS Skåne, a year later. Read more: Interestingengineering.com