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.

RSS Reviews  (0 - 10 of 22)

+Level design, its top notch. Way better than the first challenger deep.
+Difficulty is fairly middle of the line.
+Quite long, took me about 3 hours.
+Great use of oxygen tanks
+Probably the best use of long jump module I've seen in a mod.
-Ammunition a bit to ample
-Bad performance on some of the maps (I counted 3)
-some bugs like managing to get the scientist to come into the room with me (when he supposed to be on the escape pod). Breaking his script that was supposed to make him open the door for me.. after running around a bit.
-Fight with the giant alien spiders was also a little to middle of the range difficulty wise. Should have doubled their health.
-Ending was a bit to easy. But hey, endings where never great for the mods I've played.

A VAST improvement over the previous mod, with greater level design and firefights!

The mod is also substantially longer, with great atmosphere and a better focus on the story and just what the scientists in challenger deep were doing at the bottom of the ocean.

It does come with it's hitches, however.

There are frame-rate issues here and there, and the larger open areas make fights overwhelming at times and hard to navigate.

However, it is a great remake of the original.

Give it a go :D


Such an amazing mod.


Could've used some additional testing as it suffer from a few bugs. A few levels are also poorly optimized with some very varying framerate especially the big open rooms.
Otherwise this a very good mod with some great and open level design. Pretty much blows away the original which was the definition of quantity over quality.

Most disappointingly however, the ending is extremely short and to be honest quite weak leaving you with a few unsolved questions.


dengar182 says

May contain spoilers Agree Disagree

Well then

Seeing as ppl are blatantly lying regarding this mod's playability, I felt the need to post this, even if years detached from its release.

I have not yelled in frustration in almost 2 decades when gaming but congratulations doc, you got me.

Please DO NOT play this mod: play the authors original creation "the challenger deep" as it is worth installing a non-steam version of HL just to play it (some ppl claimed to have issues with steam at some time with the og mod but I never had the issue). From my playthrough it is painfully obvious that the author performed zero to little playtesting (at least two areas that are absolutely broken and one that is intermediately broken), nor did the author care to optimize anything.

Where to start?
This mod is PAINFUL to navigate: mostly due the lighting. You will spend 85 percent of your play time either walking around entire rooms following a wall clockwise/counterclockwise with your flashlight aimed at the walls edge and floor or giving up in every room youve spent 10 minutes in to noclip OOB just looking for an exit. Your only other option is to nuke the game with gamma and brightness on near max (which would ruin the whole point of the mod, bye bye claustrophobia and immersion) so be prepared to spend about 10 to fifteen minutes of your playthrough idling in the dark so you can start searching some more once your battery recharges. In the beginning, the vent puzzle was fun, But im sad to say it was the last clever bit of level design encountered until I reached the rope puzzle in the chapter "end game". (also did I miss prior title cards or did you just put them in the last half of the game?) Speaking of the rope puzzle: I NOCLIPPED PAST IT. You had already sullied any trust I had in you with regards to the puzzle being passable (though its all any of us wanted to do when you introduced them in the training course as ropes are generally just props or limited to the broken opforce swingy ones and in online maps). Thats how painful this mod is to play: when you finally get to a platforming bit you were looking for since the first map, you would be actually crazy to attempt it. Had I encountered that puzzle waaaaay earlier it probably would have been THE HIGH POINT OF MY REVIEW. Also If you made it to the area with the tentacles (sorry if I spoil anything here but its relevant) after you groan, you will find the first completely broken area where in a climbing puzzle it seems that the author wants to commit suicide multiple times till you find the ONE long jump (out of about 6) you actually can make, or he forgot a ledge or ladder (there are two such places where it looks like a ladder was meant to go up but it instead goes down to make the area recursive). In this area even nuking the screen with gamma on max did not provide me with a passable route, and after you make it through there you encounter YET ANOTHER blockage. After you fight the marines in the supply room, There is no way to access the alcove at the end of the hallway where the vent used top exit the area sits, behind some boxes in a completely dark area. Oh and if you do play this mod im also spoiling this: just grenade every dark alcove or behind every box after you start seeing marines. (oh and I didnt get to escape the facility the first go because a level load broke towards the end and I was stuck in limbo staring at the sub)

I wish you the best doc, but I dont know what happened with this atrocious mess: I see soo much wasted effort and potential here. When I saw you had released a remake I was thrilled and couldnt wait to play it. The intro and first hour were fun and almost had me back in that "im gonna drown if im not careful" mood. infact the scariest part of the og CD was the underwater portions and they are just filler in this mod. Gone are the floods, gone is the sense of urgency, and most of all the atmosphere of the original mod is nowhere to be found save the first hour of the game. What made me post this rambling review is solely that this could have been fixed with just simple playtesting. This mod is soo arduous that you dont even get the accomplished feeling of passing an area, you just feel tired and VERY annoyed. So please, I beg you, if you made it this far, go install the challenger deep and avoid this mod like stale leftovers. (Doc, Im sorry as I loved CD soo much even with its quirks but this is a world apart)

PS: I know some guy up there told you "the mod needs assassins and less lights" but didnt every single playthrough having the brightness and gamma maxed out tell you that at least ONE of those additions/omissions was a flawed idea?

A little confusing but the setting is rather unique.

* you may find yourself constantly getting stuck.
* the parts where you have to go with scientists are pretty buggy and just feels like you're baby sitting them.
* there's some performance issues here and there (especially for Intel integrated graphics cards) I recommend using "r_dynamic 0" if you keep lagging.
* there's some obnoxious horrible quality music which plays occasionally (reminds me of mic spamming even), thing is the music is played on the map so you can't exactly turn it off.
* there's a couple of forced cut-scenes and I extremely hate the first one since it almost got me killed.
* there are some great long jumping sequences here and there.
* the fighting is nice, even though some enemies seem like they were randomly placed (barnicles for example).

it's a fine mod
(completed about 70% of it)

The Good:
+Level design is really detailed and cool.
+use some cut resources from Half-life in a creative way.
+It's Hard, but not super hard XD

The Bad:
-Well, half-life bugs XD
-Some maps are really bug and its easy to get youself lost, or waste a lot of time checking fake paths (but isn't that bad, personally i like this, but i know a lot of people dislikes.

The Ugly:


Truely epic :) Some minor flaws don't affect the tremendous work in overall.


Aublak says

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.

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Highest Rated (2 agree) 10/10

+Level design, its top notch. Way better than the first challenger deep. +Difficulty is fairly middle of the line. +Quite long, took me about 3 hours. +Great use of oxygen tanks +Probably the best use of long jump module I've seen in a mod. -Ammunition a bit to ample -Bad performance on some of the maps (I counted 3) -some bugs like managing to get the scientist to come into the room with me (when he supposed to be on the escape pod). Breaking his script that was supposed to make him open the door…

Sep 26 2013 by TheUnbeholden