🌊 Waves at the surface bend sunlight into bright, wobbling lines on the bottom. Optics calls them caustics, from the Greek for burnt. Here they fall through gaps in a reef overhang at Shaab Sheer, Safaga, onto white sand. #caustics #ShaabSheer #Safaga #RedSea
🐠 A coral hind holds its ledge at Gamul Kebir, blue spots on red, and waits. Over 80 % of what it eats is small fish, mostly sea goldies, taken in one rush up from the bottom. A few metres on, the reef top is a cloud of orange anthias in the light this shallow reef is known for. #coralhind #grouper #anthias #GamulKebir #RedSea
🫧 Out of the deep blue, mouth wide, then overhead so close its wing blocks the sun. The Maldives is home to the largest known population of reef mantas in the world, a whole nation of them gliding past the atolls. #mantaray #maldives #mantas #underwater #bluewater
🧠 Manta rays have the largest brain of any cold-blooded fish, both by weight and for their body size. They take their time with life too: mantas may live at least 50 years. And no stinging spine in the tail 💙 Just wide wings over the reef and the light coming down from above.
#mantaray #manta #gentlegiant #oceanlife #underwater
💤 Upside-down jellyfish were the first animals without a central nervous system seen to sleep: they pulse slower at night, and kept awake, they are sluggish the next day. This Cassiopea, in full daylight at Shaab Sheer, is up and swimming, frilly arms pointed at the sun. #cassiopea #upsidedownjellyfish #jellyfishsleep #shaabsheer #redsea
🪸 On a table coral, tan is living tissue, bright white is recent loss, and brown is older dead skeleton under algae.
Which is exactly why this table at Ras Abu Soma carries all three at once: a brown band through the middle, white at its ends, living coral round it.
#tablecoral #acropora #coralhealth #RasAbuSoma #redsea
🐠 Odonus niger can reach about 50 cm including the tail but rarely goes past 30, according to DORIS.
This one swims left to right over the sand at an unhurried pace, showing the full length of its body.
#odonusniger #triggerfish #redtoothedtriggerfish #divelife #underwaterworld
A sea turtle is cold-blooded 🐢, so it keeps to wherever the water itself lies warm.
which is exactly why this one holds the lit water over the reef instead of the cooler open blue behind it.
#seaturtle #cheloniidae #coldblooded #coralreef #diving
🪸 A young clown triggerfish spends its early life tucked into small caves thick with invertebrate growth, staying out of sight. Grown, it trades all that for open water along the reef slope.
🤿 This one is full size, cruising the coral with nothing to hide behind.
#clowntriggerfish #reeffish #coralreef #scubadiving #marinelife
Spaced evenly around the edge of a moon jellyfish's bell sit eight tiny sensory organs 👀 each one carrying a light-detecting eyespot and a gravity sensor, so the animal knows which way is up and where the light is without a brain to think about it.
A drifting bloom of them, house reef.
#moonjellyfish #jellyfish #marinebiology #scubadiving #underwater
🫧 A hawkfish is an ambush predator that eats crabs and small fish — and at a cleaning station it simply switches off, fins spread, gills open, letting a wrasse a fraction of its size work it over.
Ten slow breaths of nothing but polyps waving and one blue fish doing its rounds.
#hawkfish #cleanerwrasse #coralreef #scubadiving #oceancalm
🧡 The orange rosette on this sea slug's back is not a flower — it is the gill it breathes through. Nudibranch means "naked gill", and here is exactly why.
One slug, one coral head, house reef.
#nudibranch #seaslug #scubadiving #reeflife #macro
🚢 This hull was launched at Cammell Laird in Birkenhead and spent years running the Liverpool–Belfast night crossing as the Ulster Queen.
She is the Al Kahfain now, down at Shaab Sheer in Egypt since November 2005, in around 25 metres of blue water.
#wreckdiving #redsea #shipwreck #egypt #scuba
🐠 Watch what a scrawled filefish does with its tail — it keeps the whole fan furled shut while it cruises, like an umbrella nobody has opened yet.
Gamul Soraya, Safaga. Red Sea, June.
#redsea #filefish #scubadiving #oceanlife #reef
🪸 Purple soft corals, a burnt-orange sponge and an orange snowstorm of anthias over the top of it all. This is a seamount off Safaga that climbs from 400 m of open water to just under the surface.
#redsea #egypt #coralreef #anthias #scubadiving
🦈 Spinner sharks can carry their pups for eleven to fifteen months, then give birth to seven to eleven live young — and only every other year.
These ones were cruising past in slow stacked layers, fusiliers scattered all around them.
#spinnershark #sharks #scubadiving #marinelife #underwater
🌊 A bluespotted ribbontail ray doesn't have to see its dinner. Pores scattered across its snout and underside read the faint electric fields that living bodies leak into seawater — a crab under the sand is still lit up to a ray.
Settled on the sand flat at Gamul Kebir, Red Sea.
#stingray #marinebiology #redsea #scubadiving #oceanlife
🦞 A spiny lobster out walking the open sand in full daylight is not the normal order of things — these animals usually pass the sunlit hours jammed into a crevice and only come out to forage after dark.
This one strolled the reef floor in front of the camera on a December dive.
#spinylobster #scubadiving #marinelife #underwater #reeflife
👀 Spiny lobsters have no pincers to fight with, yet this one walked straight out across bare sand instead of backing into a hole.
🦞 Its defence is the spined antennae and a rasping screech it makes by rubbing them against a file under each eye.
#spinylobster #scubadiving #marinelife #reef #wildlife
☀️ Silhouetted against the surface they could be a flock circling overhead. They are triggerfish, and this is the Egyptian Red Sea.
Ras Abu Soma, looking up from mid-water.
#redsea #triggerfish #egyptdiving #scubadiving #oceanlife
