Open until 11pm • Daily departures • Call (305) 391-4040
Key Largo Scuba Diving LogoKey Largo Scuba Diving
  • Dive Trips
    All Key Largo Dive Trips

    Compare every reef, wreck, and night charter.

    Reef Dives

    Shallow reefs, vibrant coral gardens.

    Wreck Dives

    Spiegel Grove, Duane, and more.

    Lobster Diving

    Season dates, regulations, and trip planning.

    Spearfishing Charters

    Scuba and freedive hunting trips with local guidance.

    Lionfish Hunting

    Conservation-focused invasive removal dives.

    Hunting Charters

    Spearfishing, lobster, and lionfish trip hub.

    Private Dive Charters

    Custom itineraries with your pro.

    Night Dives

    Bioluminescence and nocturnal life.

    Private Charter
    Ultimate Scuba Experience Trip
    • • PADI Dive Pro
    • • 2 tanks · 2 locations
    • • Private boat + captain
    • • Private instructor
    • • Longer dive times
    • • Best overall experience
    $749 · In-water guide →
  • Snorkeling Tours
  • Certification
    All Courses

    Explore every certification.

    Try Scuba Diving

    Pool training + 2 reef dives.

    Open Water Certification

    Beginner • 2 days.

    Open Water Referral Dives

    Complete your dives in Key Largo.

    Refresher Course

    Update your skills

    Advanced Open Water

    Learn advanced skills

    Rescue Diver

    Manage emergencies confidently.

    PADI Medical Questionnaire

    Download required form

    Bundle & Save
    Training, Diving, and Hotel Packages available year round.
    Creekside Inn hotel
    Browse Certifications →
  • Best Snorkeling in Key Largo

    Complete local guide to top sites, tours & tips.

    Christ of the Abyss Snorkeling

    Underwater statue guide: depth, conditions & what to expect.

    Scuba Diving for Beginners

    First-timer guide: Try Scuba vs certification, what to expect & how to start.

    Try Scuba vs Certification

    Decision guide: Compare time, cost, depth & best fit for your trip.

    Private vs Group Snorkeling

    Compare private charters and group trips: costs, flexibility, and best fits.

  • Dive Sites
  • Scuba Gear
Dive Packages
Key Largo Scuba Diving LogoKey Largo Scuba Diving
    • All Key Largo Dive Trips

      Compare every reef, wreck, and night charter.

    • Reef Dives

      Shallow reefs, vibrant coral gardens.

    • Wreck Dives

      Spiegel Grove, Duane, and more.

    • Lobster Diving

      Season dates, regulations, and trip planning.

    • Spearfishing Charters

      Scuba and freedive hunting trips with local guidance.

    • Lionfish Hunting

      Conservation-focused invasive removal dives.

    • Hunting Charters

      Spearfishing, lobster, and lionfish trip hub.

    • Private Dive Charters

      Custom itineraries with your pro.

    • Night Dives

      Bioluminescence and nocturnal life.

    • Private Charter
      Ultimate Scuba Experience Trip
      $749 · In-water guide →
  • Snorkeling Tours
    • All Courses

      Explore every certification.

    • Try Scuba Diving

      Pool training + 2 reef dives.

    • Open Water Certification

      Beginner • 2 days.

    • Open Water Referral Dives

      Complete your dives in Key Largo.

    • Refresher Course

      Update your skills

    • Advanced Open Water

      Learn advanced skills

    • Rescue Diver

      Manage emergencies confidently.

    • PADI Medical Questionnaire

      Download required form

    • Bundle & Save

      Training, Diving, and Hotel Packages available year round.

      Browse Certifications →
    • Best Snorkeling in Key Largo

      Complete local guide to top sites, tours & tips.

    • Christ of the Abyss Snorkeling

      Underwater statue guide: depth, conditions & what to expect.

    • Scuba Diving for Beginners

      First-timer guide: Try Scuba vs certification, what to expect & how to start.

    • Try Scuba vs Certification

      Decision guide: Compare time, cost, depth & best fit for your trip.

    • Private vs Group Snorkeling

      Compare private charters and group trips: costs, flexibility, and best fits.

  • Dive Sites
  • Scuba Gear
Call (305) 391-4040Dive Packages
Flash Bonus: Add a regulator today and get complimentary assembly ($60 value)
Ocean Reef GSM Mercury Underwater Communication unit
Ocean Reef GSM Mercury Underwater Communication Unit image 2
Ocean Reef GSM Mercury Underwater Communication Unit image 3
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Ocean Reef GSM Mercury Underwater Communication Unit image 5
Ocean Reef GSM Mercury Underwater Communication Unit image 6
Ocean Reef GSM Mercury Underwater Communication Unit image 7
Ocean Reef GSM Mercury Underwater Communication Unit image 8
Ocean Reef GSM Mercury Underwater Communication Unit image 9
Ocean Reef GSM Mercury Underwater Communication Unit image 10
Ocean Reef GSM Mercury Underwater Communication Unit image 11
Pro Feature

Adaptive Lift System

Auto-adjusts buoyancy and airflow routing as you change depth for steadier neutral buoyancy.

Pro Feature

CarbonFlex Backplate

High-strength carbon fiber harness eliminates pressure points during long multi-dive days.

Pro Feature

Travel-Ready Build

Folds into a 17 lb carry setup with quick-release weight pockets and modular accessory rails.

Exclusive Launch

Ocean Reef GSM Mercury Underwater Communication Unit

Ocean Reef GSM Mercury Underwater Communication unit for 1 diver.

4.9 (248 reviews)•

$799.95

Free 2-day shipping

Split payments from $104/mo

All orders include 60-day fit guarantee and complimentary hose configuration.
Free courier delivery in South Florida. Returns processed in under 48 hours.

Ships Today

Order by 3pm ET, leaves our warehouse same-day.

Gear Concierge

30-minute setup call with a PADI IDC instructor.

Lifetime Service

Free first annual inspection on regulator pairings.

Why divers choose it

Designed alongside technical instructors in Key Largo drift channels, Hydros Apex Elite balances streamlined trim with accessibility. Quick-release shoulder ladders make donning effortless, while the adaptive wing redistributes lift to keep you neutrally buoyant even when gas shifts during multi-tank dives.

  • Includes accessory docking rail for DSMB, reel, and camera arms.
  • HarnessLock system maintains custom fit between fresh and salt water conditions.
  • Pair with any DIN or Yoke regulator using included adapter kit.

Customer Proof

248 reviews • 97% would recommend • Lifetime service center

Game changer for current diving

I upgraded from a jacket-style BCD and immediately felt the difference. The HarnessLock keeps everything tight even in strong drift. Love the modular storage for reels and DSMBs.

Taylor P.

Worth the investment

As a dive guide I need gear that takes a beating. The carbon backplate distributes weight perfectly and dries fast between double tank days.

Marco D.

Read full reviews

Technical Specifications

Lift Capacity
35 lbs (all sizes)
Weight System
Integrated quick-release, 20 lb total
Material
Cordura® 1000D exterior / Carbon composite frame
D-Rings
9 stainless + 4 polymer modular rails
Travel Weight
7.4 lbs including inflator hose
Warranty
Limited lifetime on seams and hardware

Bundle Builder

Boost average order value with pre-configured pairings.

Apeks XTX200 Regulator SetBundle & Save

Apeks XTX200 Regulator Set

Bundle to save $120 and qualify for free annual tuning.

$899Add Bundle
Garmin Descent Mk2i ComputerFinancing eligible

Garmin Descent Mk2i Computer

Add for $1,499 and unlock air integration training series.

$1,499Add Bundle
Save-A-Dive Pro KitAttach Rate Leader

Save-A-Dive Pro Kit

Attach to rear MOLLE rail. Includes spares, tools, and SMB clip.

$129Add Bundle

Need a hand?

Schedule a fit consultation or in-store demo in minutes. Perfect for ad traffic looking for validation before checkout.

Response in under 5 minutes daily 8am–10pm ET.

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Ocean Reef GSM Mercury Underwater Communication Unit

Select options to continue

$799.95

Includes free 2-day shipping

Key Largo Scuba Diving Logo

Key Largo Scuba Diving is a full service dive shop in the Florida Keys offering daily scuba training & certification, exclusive dive & snorkel charters, and access to the most dive & snorkel trips in South Florida.

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PADI PROFESSIONALS
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Key Largo Scuba Diving102900 Overseas Hwy #6
Key Largo, FL 33037

(305) 391-4040
dive@keylargoscubadiving.com

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365 days per year • 7:30am - 11:00pm EST

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Open until 11pm • Daily departures • Call (305) 391-4040
Key Largo Scuba Diving LogoKey Largo Scuba Diving
  • Dive Trips
    All Key Largo Dive Trips

    Compare every reef, wreck, and night charter.

    Reef Dives

    Shallow reefs, vibrant coral gardens.

    Wreck Dives

    Spiegel Grove, Duane, and more.

    Lobster Diving

    Season dates, regulations, and trip planning.

    Spearfishing Charters

    Scuba and freedive hunting trips with local guidance.

    Lionfish Hunting

    Conservation-focused invasive removal dives.

    Hunting Charters

    Spearfishing, lobster, and lionfish trip hub.

    Private Dive Charters

    Custom itineraries with your pro.

    Night Dives

    Bioluminescence and nocturnal life.

    Private Charter
    Ultimate Scuba Experience Trip
    • • PADI Dive Pro
    • • 2 tanks · 2 locations
    • • Private boat + captain
    • • Private instructor
    • • Longer dive times
    • • Best overall experience
    $749 · In-water guide →
  • Snorkeling Tours
  • Certification
    All Courses

    Explore every certification.

    Try Scuba Diving

    Pool training + 2 reef dives.

    Open Water Certification

    Beginner • 2 days.

    Open Water Referral Dives

    Complete your dives in Key Largo.

    Refresher Course

    Update your skills

    Advanced Open Water

    Learn advanced skills

    Rescue Diver

    Manage emergencies confidently.

    PADI Medical Questionnaire

    Download required form

    Bundle & Save
    Training, Diving, and Hotel Packages available year round.
    Creekside Inn hotel
    Browse Certifications →
  • Best Snorkeling in Key Largo

    Complete local guide to top sites, tours & tips.

    Christ of the Abyss Snorkeling

    Underwater statue guide: depth, conditions & what to expect.

    Scuba Diving for Beginners

    First-timer guide: Try Scuba vs certification, what to expect & how to start.

    Try Scuba vs Certification

    Decision guide: Compare time, cost, depth & best fit for your trip.

    Private vs Group Snorkeling

    Compare private charters and group trips: costs, flexibility, and best fits.

  • Dive Sites
  • Scuba Gear
Dive Packages
Key Largo Scuba Diving LogoKey Largo Scuba Diving
    • All Key Largo Dive Trips

      Compare every reef, wreck, and night charter.

    • Reef Dives

      Shallow reefs, vibrant coral gardens.

    • Wreck Dives

      Spiegel Grove, Duane, and more.

    • Lobster Diving

      Season dates, regulations, and trip planning.

    • Spearfishing Charters

      Scuba and freedive hunting trips with local guidance.

    • Lionfish Hunting

      Conservation-focused invasive removal dives.

    • Hunting Charters

      Spearfishing, lobster, and lionfish trip hub.

    • Private Dive Charters

      Custom itineraries with your pro.

    • Night Dives

      Bioluminescence and nocturnal life.

    • Private Charter
      Ultimate Scuba Experience Trip
      $749 · In-water guide →
  • Snorkeling Tours
    • All Courses

      Explore every certification.

    • Try Scuba Diving

      Pool training + 2 reef dives.

    • Open Water Certification

      Beginner • 2 days.

    • Open Water Referral Dives

      Complete your dives in Key Largo.

    • Refresher Course

      Update your skills

    • Advanced Open Water

      Learn advanced skills

    • Rescue Diver

      Manage emergencies confidently.

    • PADI Medical Questionnaire

      Download required form

    • Bundle & Save

      Training, Diving, and Hotel Packages available year round.

      Browse Certifications →
    • Best Snorkeling in Key Largo

      Complete local guide to top sites, tours & tips.

    • Christ of the Abyss Snorkeling

      Underwater statue guide: depth, conditions & what to expect.

    • Scuba Diving for Beginners

      First-timer guide: Try Scuba vs certification, what to expect & how to start.

    • Try Scuba vs Certification

      Decision guide: Compare time, cost, depth & best fit for your trip.

    • Private vs Group Snorkeling

      Compare private charters and group trips: costs, flexibility, and best fits.

  • Dive Sites
  • Scuba Gear
Call (305) 391-4040Dive Packages