688(I) Hunter/Killer
Released Oct 2006
688(I) Hunter/Killer, the most realistic submarine simulation ever developed for PC. Master the sonar and weapons control systems, learn to develop real target situations and outfit your boat with the latest advanced weaponry. Then use your skills to complete the tour of duty and earn your dolphins to become a true submariner.
81% positive · 226 reviews
Done
All announced content has been released
High confidence
Done
All announced content has been released
High confidence
Where to buy
Steam Lowest $1.99 $9.99 −80% Green Man Gaming Steam key $9.99
Can't confirm — worth a look
We couldn't confirm these stores carry this game.
IndieGala Steam key Search Prices in USD, as listed by each store.
Buying through an affiliate store helps support the site
Evaluation
688(I) Hunter/Killer is a submarine simulation game that was released on October 26, 2006. It was developed by Sonalysts, a defense contractor that builds submarine simulators for the US Navy. The store description presents the game as a complete, self-contained product covering a full campaign, training missions, single missions, and multiplayer — with no mention of planned expansions, DLC, seasons, or ongoing content. There are no DLC listings, no developer news posts, and no announcements of future content of any kind. The game launched nearly two decades ago as a finished product and has had no post-launch content cycle. It is complete as shipped.
Evidence
Store description presents the game as a complete product with a full campaign, training modes, multiplayer, and detailed simulation systems. No mention of planned DLC, expansions, or post-launch content.
Game released October 26, 2006 with no DLC listings, no news posts, and no post-launch content cadence of any kind.
Media
Details
Developer
Publisher
Strategy First
Achievements
—
Platform
Windows
Controller
—
Steam Deck
Unsupported
Players
Single-player · Multiplayer
About this game
688(I) Hunter/Killer, the most realistic submarine simulation ever developed for PC. Master the sonar and weapons control systems, learn to develop real target situations and outfit your boat with the latest advanced weaponry. Then use your skills to complete the tour of duty and earn your dolphins to become a true submariner.
- A truly authentic simulation: Developed by Sonalysts, a defense contractor who designs submarine simulators for the US Navy
- Over 12 detailed operating stations: Control all aspects of submarine warfare, including the sonar suite, fire control, helm and target motion analysis
- Real-World Terrain: Ocean depth and water density for the entire globe are based on actual satellite topographical data
- Real-life situations: Conduct detailed training and single missions, plus a full campaign based on political analysis from real world situations
- Multiplayer Warfare: Seek and Destroy up to 8 players over the internet or LAN
- Full 3D Technology: Full 3D technology allows for multiple camera views and accurate 3D models of over 20 different naval weapons platforms
- Complete Control: Manage all of the resources of your submarine, including crewmen training and weapons load-outs
Are these done yet?
Last evaluated Jun 28, 2026
Something about this evaluation looks wrong Report illegal or harmful content