Sea caves of the world

Blue holes, sea caves, lava tubes and flooded cave systems: their depth, shape and the life that hides inside.

Blue hole

Taam Ja' Blue Hole

Chetumal Bay, Mexico

Not divable 420 m

Blue hole

Dragon Hole (Sansha Yongle)

Paracel Islands, South China Sea

Not divable 301 m

Blue hole

Dean's Blue Hole

Long Island, Bahamas

Advanced 202 m

Blue hole

Dahab Blue Hole

Dahab, South Sinai, Egypt

Advanced 130 m

Blue hole

Great Blue Hole

Lighthouse Reef, Belize

Advanced 124 m

Underwater cave system

Sac Actun

Tulum, Quintana Roo, Mexico

Technical 119 m

Underwater cave system

Dos Ojos

Tulum, Quintana Roo, Mexico

Intermediate 119 m

Lava tube

Túnel de la Atlántida

Malpaís de la Corona, Lanzarote, Spain

Technical 64 m

Underwater cave system

Cenote Angelita

Near Tulum, Mexico

Advanced 60 m

Sea cave

Cosquer Cave

Calanques, Marseille, France

Not divable 37 m

Sea cave

Nereo Cave

Capo Caccia, Sardinia, Italy

Advanced 35 m

Blue hole

Blue Holes (Palau)

Ngemelis, Palau

Intermediate 35 m

Underwater cave system

Lucayan Caverns

Grand Bahama, Bahamas

Technical 30 m

Blue hole

Gozo Blue Hole

Dwejra, Gozo, Malta

Intermediate 26 m

Sea cave

Rikoriko Cave

Poor Knights Islands, New Zealand

Beginner 26 m

Sea cave

Blue Grotto (Capri)

Capri, Italy

Not divable 22 m

Sea cave

Cathedrals of Lanai

Lanai, Hawaii, USA

Intermediate 18 m

Sea cave

Blue Cave (Biševo)

Biševo, Croatia

Not divable 15 m

Sea cave

Chandelier Cave

Koror, Palau

Beginner 12 m

Sea cave

Painted Cave

Santa Cruz Island, California, USA

Not divable 10 m

Sea cave

Thunderball Grotto

Staniel Cay, Exuma, Bahamas

Beginner 5 m

Sea cave

Sea Lion Caves

Florence, Oregon, USA

Not divable 5 m

Sea cave

Fingal's Cave

Staffa, Inner Hebrides, Scotland

Not divable 5 m

Sea cave

Benagil Cave

Lagoa, Algarve, Portugal

Not divable 3 m