The 1.2 version of U-Boot - submarine game for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. U-Boot - submarine game was developed to work on Mac OS X 10.6 or later.
We recommend checking the downloaded files with any free antivirus. This Mac application is a product of Bootant LLC. The software lies within Games, more precisely Action. The program is sometimes distributed under different names, such as "U-Boot". The following versions: 1.2 and 1.1 are the most frequently downloaded ones by the program users.
From the developer:
U-Boot is a very enjoyable side-scrolling submarine game for your Mac. Navigate your submarine. Shoot torpedoes and mines. Avoid dangerous obstacles (mines, jellyfish, enemy submarines,...). Collect bonuses and power-ups (stars, shields, propellers, torpedoes,...). There are three game types and many levels. Enjoy the game!
You may want to check out more software for Mac, such as GAMS Terminal, Military Submarines Encyclopedia or Secret Missions - Mata Hari and the Kaiser's Submarines, which might be related to U-Boot - submarine game.