Seawolf provides a fascinating insider’s look at one of the world’s most remarkable structures. Called "the most complex military machine of the 20th Century," the $2.3 billion Seawolf submarine is a prototype for the U.S. Navy’s undersea future. Subscribe to Spark for more amazing science, tech and engineering videos - https://goo.gl/LIrlur Follow us on Facebook: https://www.facebook.com/SparkDocs/ Follow us on Instagram: https://www.instagram.com/spark_channel/hl=undefined Content licensed from Kew Media to Little Dot Studios. Any queries, please contact us at: [email protected] #spark #sparkdocumentary #sciencedocumentary