Hint :
Hint: Ajanta Temple: Bonus item:
Go to the very bottom and keep going right. Go in the door and up to the Buddha statue. After completing the level, you will get the Pneumatic Speargun as a second weapon alongside the mandatory one.

Hint: Australian Reef: Bonus item:
Dive down and look for something yellowish in a crevice. You will find a fat rich man's camera. Find the boat to get the High Tech Fins.

Hint: California Beach: Bonus item:
The secret item in this level is the Improved Suit.

Hint: Caribbean Wreck: Bonus item:
Go to the back of the ship where the propellers are located. Go down the second or first step, turn around, and go through the door that appears. Go up the stairs and turn right. Go into one of the doors and you will see the Lost Diver. Kill the two Hammerheads to get the Improved Tank.

Hint: Cuba Caves: Bonus item:
Go to where the Bull shark is located. After swimming away from the tube from which you entered his enclosure, head down and look near there to find a treasure chest. You will get the Improved Fins when you complete the level.

Hint: Florida Platform: Pop-bottle mini-sub:
Go 5 degrees north and swim down the underwater crater. Turn around and swim through the ivy to find a little pop-bottle mini-sub.

Hint: Rhodes Temple: Bonus item:
Swim around until you reach the main box-like "temple". Enter it and follow the trail or the one in the hidden door near the temple's door to find some old worthless pottery called "Priceless Treasure". After killing the Lemon sharks, you will get the Heavy Pneumatic Speargun.