Top Dive Sites
Marine Mammals
Fish
Scuba Rules and Safety
Deep-Sea Nightmares
100
This Australian reef system is the largest in the world.
Great Barrier Reef
100
These intelligent marine mammals are known for using echolocation and playful behavior.
dolphins
100
This orange fish lives symbiotically with sea anemones.
clownfish
100
The general recommended maximum ascent rate is this many feet per minute.
30 feet per minute?
100
This shark has a long, flattened snout and can shoot its jaw forward to catch prey. 
goblin shark
200
This famous circular sinkhole in Belize is over 400 feet deep.
Great Blue Hole
200
The largest animal to ever live on Earth belongs to this group.
whales (specifically the blue whale)
200
This invasive species in the Atlantic has venomous spines and no natural predators there
lionfish
200
This technique prevents ear injury by balancing pressure in your ears
equalizing
200
Despite its name, this creature is not a squid or an octopus and turns itself inside out to look bigger
Vampire Squid
300
This WWII wreck in the Red Sea is known for its cargo of motorcycles and rifles.
SS Thistlegorm
300
These marine mammals are often called “sea cows.”
manatees
300
This large, flat fish often glides gracefully and can have wingspans over 20 feet
manta ray
300
Divers typically perform this pause at 15 feet for 3 minutes before surfacing.
safety stop
300
This fish has a transparent head, allowing it to see upward through its skull.
barreleye fish
400
Divers here can touch two continental plates at once in crystal-clear water.
Silfra Fissure
400
Unlike seals, these mammals have external ear flaps and can “walk” on land
sea lions
400
This fish can breathe through its skin and is known for hiding in reef crevices
moray eel
400
This SDI pre-dive safety check uses the acronym ABCDE. Name each step in order.
Air, BCD, Computer, Dive Gear, Enter
400
This eel-like creature has an enormous mouth it uses like a net to catch prey.
gulper eel
500
This Thailand dive site is famous for whale shark sightings and strong currents.
Richelieu Rock
500
This apex predator is technically the largest member of the dolphin family.
orca (killer whale)
500
This fish plays a key role in reef health by eating algae and producing sand.
parrotfish
500
This condition occurs when nitrogen bubbles form in the body due to improper ascent.
decompression sickness (the bends)
500
This deep-sea fish has the largest teeth relative to body size of any ocean animal.
Fangtooth Fish