- Mª Claudia
- M.A.A.C
- Ma An Reef 野銀馬鞍礁
- Ma Asin
- Maabaidhoo Kandu
- Maafahi Corner
- Maafaru
- Maafaru Caves
- Maafaru Thila
- Maafushi Caves
- Maafushi Lagoon
- Maagiri
- Maagiri Thila
- Maakana Corner
- Maakandu Outside
- Maalhaveli Outside
- Maalhos House Reef
- Maalhos Manta Point
- Maalhos Thila
- Maamigili Beyru
- Maamunagaa Giri
- Maaneyreh
- Maarehaa Kandu
- Maarikilu Caves
- Maarssenveenseplas
- Maava Kandu
- Maavaru Manta Point
- Maavaru Thila
- Maaya Thila
- Maaya Thila, North Ari Atoll
- Mabouya Garden, Carriacou
- Mabouya Whirlpool, Carriacou
- Macaro Faana Thila
- Macaxeira
- Maccallum Girls
- Macdonald Bridge
- Machette
- Maclearie Park
- Macro Haven
- Macro Jetty
- Macro Mania
- Mac’s Reef Oil Platform
- Madame Beach
- Madeirense (Wreck)
- Madelines
- Mademoiselle Rose
- Maderno, Palestra Subacquea Sommozzatori Bresciani Leonessa
- Mades
- Madi gaa
- Madi Miyaru Kanmathi
- Madigaa
- Madivaru Beru
- Madivaru Beyru
- Madivaru Channel
- Madivaru Corner
- Madivaru Finolhu
- madonna
- Madonna Rock Deep
- Madonna Rocks
- Madonnina
- Madrépore Manta Point
- MADUVVARI DHEKUNU KANN
- MADUVVARI HAA
- MADUVVARI IRUMATHI KANN
- Mae Ilha Caves
- Maeda Kikumaru Buoy
- Maeda Sentan
- Magazine Reef
- Magdalena Bay
- Magey Modu Thila
- Maggie's Maze
- Magic II
- Magic Island House Reef
- Magic Point
- Magic Point
- Magic Rock
- Magic Wall
- MagiColor
- Magnet
- Magno Cave
- Magu
- Magu 1
- Magu 2
- Maguey Pinacles
- Maguroana
- Mahahual Reef
- Mahala
- Mahana Park
- Mahanga Bay
- Maheleg
- Maherida
- Mahibadhoo Rock (Manta Point)
- Mahurangi Island
- Mai Thon
- Main Beach Wreck - Tassie III
- Mainit
- Maior Recife Natural de Portugal
- Maison Verte
- Maite
- Majestic Unicorn Cove (Muc)
- Makiminato
- Makronisi
- Makunu Sidi
- Makunudu Plateau
- Mala Afrika
- Mala (Charco del Palo)
- Mala Dragica
- Mala Wharf
- Malaga Cove
- Malahi Reef
- Malakoff Wreck
- Malathu Island
- Maldivas
- Maldives Victory (Wreck)
- Male' Caves Divesite
- Male Srakane, Cave, Kroatien
- Malepasso
- Malgrats Este
- Malhos Tila
- Mali Cutin
- Mali Lošinj Cikat Bay
- Mali - Mali
- Malibu Bay
- Malo Kolo
- Maloneys Beach
- Malong Bay/Turtle Rock
- Malpelo
- Malpique
- Malpique: Colada Teneguía
- Malpique - Cruces
- Malpique: Torre de Malpique
- Malu’s Mermaid Retreat
- Malvin Norte
- Malvin Sur
- Mama Hanh Beach
- Mama Viña
- Mama Viña (Wreck)
- Maman
- Maman Right
- Mamaru
- Mamas / T-Reef, Madeira
- Mambo
- Mammoth Lake
- Mammuthone
- Man and Wife Rocks
- Man O War Shoal
- Manaca1
- Manantial La Media Luna
- Manantial Media Luna
- Manchones National Park
- Mandarin Garden
- Mandarin House
- Mandarin Valley
- Mandolin
- Mandria Pots
- Mandu
- Mandy Ray Wreck
- Mandy's Eel Garden
- Mangel Halto
- Mangel Halto Reef
- Mango Bay
- Mango Bay Ko Tao
- Mangrove
- Mangrove Bay
- Mangrove Corner
- Mangrove Point
- Manhattan Plaza Health Club
- Maniguin Island
- Manijin Island
- Manila Channel
- Manly Bommie
- Manly Cove
- Manolo Cave
- Mansfield Dam Park
- Mansud Wall
- Manta Arch South Solitary Island
- Manta Bay
- Manta Bay 3 - the Crack
- Manta Bay Racha Noi
- Manta Bommie
- Manta City Point
- MANTA DIVE CENTER
- Manta Dive-garden Eel Cove
- Manta Drop
- Manta Point
- Manta Point
- Manta Point
- Manta Point
- Manta Point
- Manta Point Dhiya Adi Faru
- Manta Point Komodo
- Manta Ray Bay
- Manta Ray Bommie
- Manta Ray Scramble
- Manta Reef
- Manta Ridge
- Manta Road
- Manta Run
- Mantas and More
- Mantigo Wreck
- Mantigue Island
- Manto de Ela
- Manuel's Wall
- Manzamo
- Manzanillo
- Mao Bay
- Maona Wreck
- Maona, wreck
- Maori Wrasse Bommie - Lady Elliot Island
- Mar Menuda
- Mara Rosa Dive (Small Trip)
- Maracaibo
- Maracaibo Reef
- Marades
- Maraldi
- Marathon Cape
- Marble Arch
- Мраморный карьер/Marble Quarry
- Marble Wreck (حطام الرخام)
- Marcella
- Marche de l’Empreur
- Marc's Dream
- Margareta af Vätö
- Margarita
- Margate Bay
- Margate Bay (55)
- Margueritte
- Mari Mari House Reef
- Maria Alice
- Maria La Gorda
- Maria Loretto, Wörthersee
- Maria Wörth, Wörthersee
- Marialva
- Mariana (Wreck)
- Marianna Shipwreck
- Marianne
- Maria’s Grotte
- Marie
- Marie Grota Cave/cliff
- Marie Pampoen
- Marienschlucht - Bodensee
- Marietta Dal (Wreck)
- Marilyn’s Cut
- Marina Bay/marita’s Rock
- Marina de Arrecife
- Marina del Este
- Marina del Este Left
- Marina del Este Nerja
- Marina San Miguel
- Marinca Rat
- Marine Center Front
- Marine Lake
- Marine Np el Toro
- Marine Park
- Marine Park Jetty
- Marine Room Turtle Reef
- Marirssa
- Maris Rock
- Maritime College
- Maritime Wreck
- Marker 32 المركب
- Marker 32 Reef
- Marlas Mystery Wreck
- Marley Point
- Marlin Pinnacles
- MarMar
- Marmoler
- Marmora Scuba Park
- Maroshi Irumathi
- Maroshi Thila
- Marsa Abu Dabab
- Marsa Abu Galawa
- Marsa Assalaya
- Marsa Baryka
- Marsa Egla
- Marsa Fekera
- Marsa Gabal el Rosas (Ducks center)
- Marsa Mourain
- Marsa Mubarak
- Marsa Murain
- Marsa Nakari House Reef South
- Marsa Samadai
- Marsa Shagra House Reef
- Marsa Shoni Bay
- Marsa Shouna
- Marsa Tondoba
- Marsa Umm Gerifat South
- Marsalforn Bay
- Martelo
- Martha's Quarry
- Martin Island
- Martini Rock
- Martini Wall
- Marty’s Cave
- Mary’s Place
- Mas Giri
- Mas Thila
- Masakijima
- Mashraba
- Massa D'or
- Massa ďOr
- Masthila
- Matahari Reef, Pulau Seribu, Jakarta
- Mataking Wreck Post
- Matapalo Rock
- Mataranka Thermal Pool and Rainbow Springs
- Matavera Point
- Matavera Wall
- Matherson Bay
- Mathifaru Caves
- Matiu-somes Wharf
- Matschelsee
- Matterhorn
- Mattsee
- Mawan
- Maya Corner, Maya Bay
- Mayan Princess House Reef
- Maycocks - Sand Channels
- Mayne Reef
- Mayne Rock
- Mazarin
- Maze - Florida
- Mbwangawa
- Mcabee
- Mckenzies Beach
- Mıddle Tree
- Meadows Center for Water and Environment, San Marcos, Texas
- Medfish
- Medfish Confined Water
- Medfish Deep OW - 40m
- Medfish Deep OW - 60m
- Medfish OW - 30m
- Medfish Pool Gokcebel
- Medhu Faru
- Medhu Ingili
- Medhu Kandu
- Medhu Outside
- Medhufushi Thila
- Media Almud
- media almud shallow
- Media Luna
- Medina
- Medregal Point
- Medu Thila
- Meeddhoo Outside
- meedhoo out
- Meedhupparu House Reef
- Meelup Beach
- Meersburg - Krebsgarten
- Meersburg - Plätzle
- Meersburg - Wilder Mann
- Megawand, Weißensee
- Meião da Brasil
- Mejean
- Melanda
- Melanda Beach
- Melanda Heights
- Melasti
- Melasti Tulamben
- Mele Reef
- Melina Island
- Melissa's Garden
- Melissa's Reef
- Melody Farm Quarry
- Mel’s rock
- Memories wreck
- Menjangan Island
- Mentawak
- Mercedes I
- Mercers Lake
- Mercers Lake - Redhill
- Merci Jesus (Wreck)
- Mercurius
- Mercy Jesus
- Meridian Beach
- Meridian Drop
- Meridian (Wreck)
- Meridiana
- Merikafalhu ( Tiger point )
- Merirendong 美人洞
- Merkanti Reef (Divewise House Reef)
- Merlin House Reef
- Mermaid Cove
- Mermaid Reef
- Mermaid Wall, Mermaid Reef
- Mermaid's Grotto
- Mermaids Kitchen
- Mermaid’s Lair
- Mermet Springs
- Mermet Springs, Il
- Mermet Springs, Southern Illinois
- Meros
- Mersinia B
- Mersinia S
- Mervillon
- Messina
- Messinghausen See im Berg
- Mesudiye Wreck
- Meteor, Arguineguin, Gran Canaria
- Metlikova
- Mettams Pool
- Mexico Rocks
- MEYYAFUSHI BEYRU
- MEYYAFUSHI KANDU
- Mezzatorre
- M/f Aerosund Ferry
- Mgarr Ix-xini
- Möhne, Delecker Brücke
- Mi Dushi (T)
- Mia Reef
- Michelin Mishiragi
- Mid Reef
- Middle Arch
- Middle Cay
- Middle Chute
- Middle Finger
- Middle Garden
- Middle Island
- Middle Reef Safaga
- Middle Rocks (Cagnipa Island)
- Middle Sambo Reef
- Middle Stone
- Middle Tree
- MiG-17 (Wreck)
- Migdalor Beach חוף המגדלור
- Miho
- Mikado Ost
- Mikado, Weißensee
- Mikes Cupboard
- Mike's Maze
- Mike's Maze
- Mike's Point
- Mike's Point
- Mike’s Wreck (Hannah M. Bell)
- Mikey's Ear
- Mikhmoret מכמורת
- Mikomoto Island
- Mikros Mourtias Beach
- Mikuni Takara Island West
- Mikurajima Island
- ¼ Mile Reef
- Milet
- Milimani South
- Mill Cove Beach
- Mill Cove Marina
- Mill Cove Wharf Beach Side
- Mill Cove Wharf Jetty Side
- Millers Beach Westhawk Lake
- Millers Point
- Milligerplas
- Million Dollar Point
- Million Hope, Wreck
- Milln Reef
- Milln Reef - The Whale
- Millyering Wall
- Mina Cristal
- Minaavaru Faru
- Minabe Syougase
- Minami Echizen
- Minami Ise
- Minerva Ledge
- Mines of Moai
- Mingo Mounds
- Mingo Pass
- Mini-blue Hole
- Mini Grotto
- Mini Wall
- Minna Cable
- Minna Lighthouse
- Minna Popeye
- Minna Port Side
- Minuano
- Mioskon
- Miracle Waters
- Miralles, Wreck
- Misery Beach
- miss oportunity
- Missing Link
- Mistaken Island
- Mitate Wreck
- Mitsio Wreck
- Mitsune
- Miyagi Channel
- Miyaren Haa
- Miyaru Gaa
- Miyaru Giri
- Miyaru Kandu
- Miyaru Thila
- Mizugama
- M&K Reef
- MKVI
- Mnemba Sandbanks
- Mobulas Hot Spot
- Moc-che
- Moc Che Deep
- Moellersee
- Mogan West
- Mogurin
- Mohawk Deer
- Moken Bay
- Molas Shipwreck
- Molasses Reef
- Molhe de. Fora
- Molly Beday
- Molnár János-barlang
- Molokini Back Wall
- MoM - Miniera Olgiate Molgora - Level 1
- Momo Beach
- Mondsee Kreuzstein
- Monem Wreck
- Monkey Beach
- Monkey Cave
- Monkey Head
- Monkey Mia Jetty
- Monkey Point
- Monkey Reef
- Monkey Rock
- Monkey Rock
- Monkeys Cave
- Mononaftis
- Mononaftis, Kreta
- Montaña Amarilla
- Montaña Guaza
- Montaña Hundida
- MONTAÑA HUNDIDA DE L’ESCULL
- Montaña Roja
- Montaña Sumergida - Cabo Negro
- Montañas Rusas
- Montague Island
- Monte Mare, Rheinbach
- Montego Bay
- Monte’s Divi Tree (H)
- Montiell / Conger Reef
- Montola
- Montseny
- Monumento Natural das Ilhas Cagarras
- Monuments/Zodiak
- Moofushi Kandu
- Moofushi Shark Corner
- Moomba Beach
- Moon hole
- Moon Hole
- Moon Island
- Moon Pool / Pozo de la Luna
- Moon Valley
- Moonhole
- Moonhole Cave
- Moonhole Wreck
- Moonlight
- Moonscape
- Moore Reef
- Moorea Whale Watching
- Moorloch
- Morada
- Moraig’s Cave
- Moray Beach
- Moray Garden
- Moray Point
- Moray Reef and Surrounds
- Mordor
- Moregallo - Le macchine
- Morges Plage
- Morries Maze
- Morrison Springs
- Morrito Largo
- Morrito Largo Tec
- Morro
- Morro Branco
- MORRO DAS CAPELAS
- Morro das Pedras
- Morro de Fora
- Morro de Toix
- Morro Tejon
- Morros Maguey
- Mortar Rock
- Mosh Beach, Eilat - החוף של מוש
- Mosh Wall
- Moso Drift Dive
- Mosquera
- Mosquito Fighter Bomber
- Mosquito Hole 蚊子坑
- Mosquito Island Reef
- Moto
- Motosuko Lake
- Motu Nuhi-Nuhi (l’aquarium)
- Mount K Avenue
- Mountain of Fishes
- Mountain Top
- Mourtias Reef
- MP-Diving
- Mpai Bay
- M’Pai Bay house reef
- Mr. Bud Wreck
- Mérouville
- Mrowiny
- MS Erner Kaulke (Wreck)
- M/S Harm
- Ms Jojo
- Ms Mikhail Lermontov Wreck
- M/S Neuenfels
- M/S Storö (Wreck)
- M/S Stråssa
- Mt. Point
- MTK Beach
- Mu Koh Angthon National Marine Park
- Muda Kan
- Mudjimba Island Reef SW
- Muelle abandonado
- Muelle de Azúcar
- Muelle de Morro Jable
- Muelle Minka Mar
- Muelle Viejo
- Mujiyan 母雞岩
- Muka Kampung
- Mulidhoo Aquarium
- Mull of Kintyre - Wilson Reef - GBR
- Mullikolhu Fara
- Mullion Harbour
- Mulloway
- Mulo lighthouse
- Mumbang Rock
- Mun-Nai Cube
- Mun Nai Jetty
- Municipal Swimming Pool
- Muniyafushi Kandu
- Munko's Garden
- Munk’s Haven
- Mur de corail/Coral Wall
- Muraidhoo Corner
- Muraka Giri
- Murata di Sant'Agostino
- Murex House Reef
- Muri Beach
- Muri Muri
- Murner See
- Murner See Badeplatz
- Murner See - Bucht
- Murner See Holzturm
- Murner See, Liegewiese Ostufer
- Murner See, Plattform Nordwest Ufer
- Murner See Rutsche
- Murner See Rutschn
- Murner See, Süd
- Murner See - Turm
- Muro Wall
- Murray Road Boat Ramp
- Murrays Beach
- Musa: Under Water Museum
- Musan
- Museo Atlantico
- Museum of Underwater Art, Coral Greenhouse
- Museum of Underwater Art (Moua) at John Brewer Reef
- Mushroom Forest & Blue Room
- Mushroom Garden
- Mushroom Rock
- Mushroom Rock
- Muskuli Thila
- Mustafa Reef
- Muthafushi Thila
- Mutsu (Wreck)
- Muttonbird Beach
- Muyuni Plate Corals
- Muzil
- Mv Alpha Funguo
- MV Ambar (Wreck)
- MV Captain Keith Tibbetts (Wreck)
- MV Equa (Wreck)
- M/v Giannoula K. - Plimmiri
- Mv Henry Bonnaud
- MV Imperial Eagle, wreck
- MV Malabar
- M.V. Mataora
- Mv New Marine
- Mv Pippo
- MV Shakem, wreck
- MV Suntud Samut 4
- Mv Xlendi
- Mwana Wa Mwana
- Mwanamoji
- Möwensee
- озеро Мядель /Myadel lake
- Mylopotas Shore Reef
- Myrmix and Lefteris – the Vera Shipwreck
- Mystery Bay
- Mystery Wreck Callala Beach
