Deep Scan is an arcade game developed and released by Sega in 1979 and 1980 (in Japan). It heavily resembles Gremlin's Depthcharge (published two years earlier, prior to their acquisition by Sega) but uses a color display instead of a black and white one. The 1983 Atari 2600 conversion was renamed Sub-Scan.
In addition to the standalone cabinet, Deep Scan was also released in various combination cabinets alongside other Sega games from the era. Much later, a port was included with the Sega Saturn conversion of Die Hard Arcade, functioning as the only way to earn extra credits for the main game.