This video shows you that Why Russia Fears Sweden’s Deadly Submarines.
Another important features is a special ‘multi-mission’ portal for deploying special forces and underwater vehicles, a much-in demand feature for contemporary submarines. Situated between the torpedo tubes in the nose, the portal can also be used to recover the AUV-6 underwater drone, which can be launched from the torpedo tubes. The A26 would typically belly down on the ocean floor when employing the portal—a maneuver which could also aid it in escaping detection.
For decades, submarines came in two discrete flavors: traditional diesel-electric submarines that need to surface every day or two to recharge their noisy, air-breathing diesel engines, and nuke-powered submarines that could quietly hum along under the sea at relatively high speeds for months at a time thanks to their nuke reactors.
The downside to the nuke-powered variety, of course, is that they cost many times the price of a comparable diesel submarines and require nuke propulsion technology, which may not be worth the trouble for a country only interested in defending its coastal waters. A diesel submarine may also run more quietly than a nuke submarine by turning off its engines and running on batteries—but only for a very short amount of time. Still, there remains a performance gap in stealth and endurance that many countries would like to bridge at an affordable price.
One such country was Sweden, which happens to be in a busy neighborhood opposite to Russian naval bases on the Baltic Sea. Though Sweden is not a member of NATO, Moscow has made clear it might take measures to ‘eliminate the threat,’ as Putin put it, if Stockholm decides to join or support the alliance. After a Soviet Whiskey-class submarine ran aground just six miles away from a Swedish naval base in 1981, Swedish ships opened fire on suspected Soviet submarines on several occasions throughout the rest of the 1980s. More recently, Russia has run an exercise simulating a nuke attack on Sweden and likely infiltrated Swedish territorial waters with least one submarine in 2014.
Back in the 1960s, Sweden had begun developing a modernized version of the Stirling engine, a closed-cycle heat conversion engine first developed in 1818. This was first used to power a car in the 1970s, then the Swedish ship-builder Kockums successfully retrofitted a Stirling engine to power a Swedish Navy A14 submarine Nacken in 1988. Because the Stirling burns diesel fuel using liquid oxygen stored in cryogenic tanks rather than an air-breathing engine, it can quietly cruise underwater at low speeds for weeks at a time without having to surface.
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