Depth
0msurface
Research Expeditions · 2023–2025

Go
Deeper.

Descend into the research.

Three research cruises. Over ten weeks at sea. A submersible dive past 2,000 metres. Three newly discovered hydrothermal vent sites on the Mid-Atlantic Ridge. Scroll to descend.

Begin descent
Expedition 01 · 2023

In Search of
Hydrothermal Lost Cities

R/V Falkor (too) · Schmidt Ocean Institute · Mid-Atlantic Ridge

The goal was to find hydrothermal vent systems like "Lost City" — rare alkaline vents formed by serpentinization, suspected to harbour chemistry closest to the conditions that may have facilitated the origin of life on Earth. We didn't find Lost City vents — but we discovered three previously undescribed black smoker hydrothermal vent sites on the Mid-Atlantic Ridge. I led the photogrammetry project and 3D vent reconstructions — and brought the discoveries to the public through my own science communication, reaching over 220,000 impressions on X (formerly Twitter). View the expedition →

R/V Falkor (too) at sunset, Mid-Atlantic Ridge
R/V Falkor (too) · Mid-Atlantic Ridge · 2023 · Photo: Schmidt Ocean Institute
Falkor bow
Bow-on in the Atlantic
ROV control room, Falkor (too)
ROV control room, Falkor (too)
Full science and ship crew · R/V Falkor (too) · 2023
Full science and ship crew · R/V Falkor (too) · 2023
Dusk from the bow
Dusk over the Atlantic

The expedition's goal was to find more vent fields like "Lost City" — the alkaline, carbonate-spire vents first discovered in 2000, formed not by volcanic heat but by a chemical reaction between seawater and exposed mantle rock called serpentinization. Scientists believe these vents may represent conditions similar to those that facilitated the origin of life on Earth, possibly on other planets too. Only a handful had ever been found.

Using ROV SuBastian, we found three new black smoker vent sites — not the Lost City-type vents we were searching for, but a significant discovery in their own right. Dense communities of vent-specific fauna never before documented at these locations. I led the photogrammetry component, building 3D reconstructions of the vent structures from ROV imagery — baseline data that lets us track how these landscapes change over time.

"These vents may harbour chemistry closest to the conditions that sparked life on Earth."

While onboard, I communicated the discoveries in real time through X (formerly Twitter), reaching over 220,000 impressions — because discoveries like this deserve to be shared as they happen.

Vessel
R/V Falkor (too), Schmidt Ocean Institute
Year
2023
Location
Mid-Atlantic Ridge
ROV
SuBastian
Discoveries
3 new hydrothermal vent sites
My role
Macrobiology team · Photogrammetry lead
My outreach
>220,000 impressions via X (Twitter) — my personal science communication onboard
Paper
Alfaro-Lucas et al. In prep.

Four minutes from the Mid-Atlantic Ridge

At the ROV control console
Discussing bathymetry with Dr. David Caress
ROV control room, all screens
Watching plume signals, Flakor (too) computer room
Laughing with David Caress at bathymetry screens
At the ROV control console — 3,732 m depth on screen
ROV sample basket
Sorting polychaete worms under the microscope
Watching live ROV feed
Examining rocks on deck with a loupe
Examining seafloor rocks at sunset
Examining freshly recovered seafloor rocks at sunset · Photo: I. Naranjo / Schmidt Ocean Institute
ROV sample basket with Monika
Retreiving biological samples from ROV SuBastian
On deck sample prep
"We are live on air" - watching the discovery of a vent
Filter work in the lab
Onboard lab work
Hydrothermal vent scene
Magnapinna sp. — Bigfin squid · extremely rare sighting
Deep-sea species
Biological planning with Dr. Joan Alfaro-Lucas
Deep-sea species
Vent crabs and shrimp · Mid-Atlantic Ridge
Deep-sea species
Chimaera · Cartilaginous deep-sea fish
Vent scene
Newly discovered vent
Deep-sea species
Sorting biological samples
Deep-sea species
Vent gastropods and Rimicaris exoculata shrimp
Deep-sea species
Deep-sea isopod
Deep-sea species
Collected specimen, brittle star
SuBastian ROV deploying, R/V Falkor (too)
Deployment of ROV SuBastian
Vent rock
Black smoker & Vent shrimp
Active vent structure
Descending further
≈ 800 – 1,200 m
Expedition 02 · 2023

Northern Cascadia
Subduction Zone

CCGS Tully · International Research Expedition · Pacific Canada

An international research expedition on the Canadian Coast Guard Science vessel CCGS Tully, focused on the Northern Cascadia Subduction Zone. My primary role was collecting high-resolution multibeam and echosounder seafloor mapping data — with some invertebrate identification from core samples on the side.

The Cascadia Subduction Zone — where the Juan de Fuca Plate slides beneath North America — shapes everything from the region's earthquake risk to its deep-sea habitats. This expedition collected high-resolution seafloor mapping data and benthic core samples, giving us a clearer picture of what lives on and in the sediment of this dynamic system.

My primary role was collecting multibeam and echosounder data — high-resolution seafloor mapping that captures the topography and physical structure of the subduction zone. I also helped with benthic invertebrate identification from core samples. This kind of foundational data — from places that are rarely visited — is what makes future monitoring and modelling possible.

Vessel
CCGS Tully, Canadian Coast Guard
Year
2023
Region
Northern Cascadia Subduction Zone, Pacific Canada
My role
Multibeam/echosounder data collection (primary) · invertebrate ID from cores
Descending further
≈ 2,000+ m
Megan Davies seated in front of DSV Alvin

Into the Abyss:
DSV Alvin

R/V Atlantis (AT50-42) · Woods Hole Oceanographic Institution

DSV Alvin is one of the most iconic submersibles in the history of ocean science — the vehicle that found the Titanic, discovered hydrothermal vents for the first time, and carried hundreds of scientists to the deep seafloor over five decades. In 2025, I dove in Alvin to establish a long-term monitoring transect for deep-sea corals and sponges.

The transect will serve as a baseline for tracking how these communities change as ocean temperatures shift and oxygen levels decline — exactly the kind of long-term data that adaptive management of deep-sea MPAs depends on.

Science crew on R/V Atlantis deck in front of Alvin
Science crew on R/V Atlantis · AT50-42
Dive team with comms headsets before launch
Pre dive photo
DSV Alvin surfacing with diver on top
DSV Alvin at the surface · diver assists recovery

Descending in Alvin takes over an hour. The light goes slowly — reds first, then everything else, until there's nothing left but the deepest blue and then dark. And then the bioluminescence starts. As we moved downward, flashes of light streaked past the windows — it looked like fireworks going upward, though really it was us moving through them. Creatures you can't even name, lighting up as the sub passed. It was magic. By the time you reach the bottom, you're in a world lit only by those flickers and the sub's floodlights. The scale of it is hard to describe.

The work I was doing — laying out a permanent transect that other researchers will return to in years and decades — carries a particular weight when you're actually sitting on the seafloor doing it. You're making a mark that's meant to outlast the expedition.

"Surreal is the only word for it. After years of studying the deep sea, suddenly it was right outside my window."

Vessel
R/V Atlantis, WHOI · cruise AT50-42
Submersible
DSV Alvin — HOV
Year
2025
Depth
> 2,000 metres
Purpose
Establish long-term deep-sea coral & sponge monitoring transect
Expedition
Nitrogen Cycling Under Pressure
View through the Alvin hatch
Closing the hatch · see you on the other side
Alvin pilot at instruments, red interior lighting
Pilot at the controls · Alvin interior lit red for dive
Pilot looking out Alvin porthole
Looking out the porthole at > 2,000 m
Reviewing the dive plan checklist inside Alvin
Working in Alvin

Arriving at the bottom

The long-term transect

A permanent monitoring transect established on the seafloor — a baseline for tracking how deep-sea coral and sponge communities change as ocean conditions shift over years and decades.

Post-dive hazing tradition with squirt bottle
Post-dive tradition · new divers get hazed
Laughing after post-dive hazing on deck
The aftermath · worth every drop
Back to the surface

There's more to explore.

The expeditions feed the research. See the publications, frameworks, and monitoring work that grows from these dives.

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