This is a remake of the original Half-Life mod The Challenger Deep. This re-designed mod has been in development for more than 7 years. It follows the same storyline as the original.

Aublak says

7/10 - Agree Disagree

Classic Half-Life gameplay. Most of the puzzles are ripped straight from Half-Life with some new ones. You better master crouch jumping before you consider starting this. Its a mod that is mainly aimed at Half-Life veterans. The levels are huge and the mod maker is really good at catching the player off guard. I was playing on hard and I admittedly found myself save scumming more then I usually do. The mod's length is considerable. Its very good at capturing the feeling of the original Half-Life. It is more Half-Life gameplay, but it is very good Half-Life gameplay. If you want more Half-Life, but grow tired of the original campaign after playing it for the 100th time this mod is for you.