This is to supplement the FAQ for Aquanaut's Holiday on the Sony 
Playstation (PSX) written by Jeezus (rufus_ki[AT}hotmail{DOT)com) 
that I found at www.gamefaqs.com. His FAQ (more of an explanation 
than an FAQ) was apparently for the Japanese version, which is 
slightly different from the English one. Since I only have the 
English one, I can't guess at exactly how the Japanese version 
looks or acts, but there are a few things I can state:

Known differences between English and Japanese versions:
1. No voice in the English version. There is a voice entry in the 
Staff listing when you get all 120 fish at the reef, but I heard 
no voices during my play of the game.
2. Staff listing is in English.
3. Don't remember seeing a beaver during the Present game. The ET 
that Jeezus refers to must be the flying saucer that's the very 
last "fish" in the Present game.

The Present Game
How to get it: Attract all 120 types of fish to your reef. When 
the red/pink bar fills completely, the screen will blank, and you 
will be told to save your game. Do so, and the PSX will restart. 
At the New/Load screen, the PSX will read your saved game and 
eventually show a third option: Present.
What to do: When you select Present, the controls for that part 
of the game will be displayed. Movement is NOT like the regular 
game, and I don't know if the "specials" are still out there. I 
did have something strange happen once where switching to one of 
the whales suddenly forced my position away from the Port.
Note that "Present" was probably "Omake" in the Japanese version, 
giving me another translation of the word for my H games FAQ.

Stuff for the Regular game
1. Buoys (points) move slightly after release, so they may not be 
exactly where you want them to be.
2. Buoys also disappear from view if you leave the area and 
return. I've never been able to spot one unless I just jumped to 
it or placed it.
3. The reef that you build is west of the Port. You can see it on 
the map, at a very small scale. It confused me the first time, 
as I thought the game's video memory was damaged.
4. You can accidentally put a reef block at a buoy location, 
causing your sub to be trapped there if you jump to it. To fix 
this, remove the blocks near the buoy, jump to it, then place 
another buoy outside the reef building area, and finally replace 
the blocks.
5. You get "credit" for reef blocks, and fill in the map, only if 
you travel around the map at less than full speed, AND close 
enough to the bottom to see it. Zipping around through open water 
gets you nothing except the edges of the map. Also, after the 
first bounce, speed is greatly reduced, and the bounces are 
direct reverses. So, leaving the game on for a while will get you 
almost nothing.
6. Using the info in Jeezus' FAQ, I was able to get all the fish 
and see the Present game after about 18 hours of play. Most of 
this was just traveling near the bottom to cover the map, and 
stopping only when I spotted something really interesting.

Specials:
I saw the "Killer Fish", but I think its really a giant 
Ceolacanth (prehistoric fish). It also starts moving once you 
bump into it!
I didn't see many of the special things others have mentioned, 
and I wouldn't want to spoil them for anyone else anyway. But I 
can confirm the "Great Wall of China" (the one I saw was bronze 
color, and had a break in the wall), and 4 large pillars with 
stains or holes on the sides.
Other people mention seeing a shipwreck, a face (probably like 
the one supposed to be on Mars), a clear sphere with another one 
inside, an aqueduct, three rocks in a triangle, a hole down that 
goes a LONG time before it ends, a fossilized fish in a green 
plant, a long trench.
There are several "lost cities".
If you think you've seen it all, keep going towards the edge of 
the map, and more will appear until you finally reach the edge of 
the water.

This is not your usual Playstation game. There is nothing to 
shoot, grab, or destroy, and no score besides the fish at the 
reef. I found the surf and music at the reef screen to be 
sleep-inducing.

Peter Karsanow
p.karsanow[AT}sbcglobal{DOT)net
http://www.geocities.com/hentaihelper/p_rpgame.htm