KEY LARGO WATER ACTIVITIES FIELD GUIDE
Jules’ Lagoon: Key Largo’s Calm Classroom for SCUBA Students
A focused 2.5-hour training session at a sheltered, 30-foot lagoon used for both open- and confined-water instruction—this guide explains what to expect and what to bring.
Jules’ Lagoon: Key Largo’s Calm Classroom for SCUBA Students.
Tucked inside Key Largo Undersea Park, Jules’ Lagoon is a glassy, sheltered basin that has become a staple classroom for SCUBA training. The site’s calm waters and controlled features make it ideal for students and instructors practicing skills in an environment designed for instruction.
Highlights
Outing Highlights
A Sheltered Open-Water Site
Though classified as an open-water site, Jules’ Lagoon is reliably calm and protected, providing a predictable place to practice buoyancy, buddy procedures, and entry skills without strong surge or currents.
Platforms, Down Lines, and 30 Feet of Water
The lagoon features platforms and down lines and reaches a depth of 30 feet—elements that instructors use to stage skill drills, ascents, and controlled descents for both confined and open-water training.
A Hub for Certification and Instructor Exams
The site is regularly used by major certification agencies for exams and has hosted hundreds of new instructors, making it a recognized training ground for both novice divers and dive professionals.
What the day feels like
What the Visit Feels Like
The admission is a concentrated training window: students arrive with their instructor, set up at the shore of the lagoon, and move through confined and open-water drills in calm, manageable conditions. The layout and consistent conditions make transitions between skills efficient—ideal for focused learning and instructor evaluations.
Suitability
Who it's for
Who this visit suits—and who should look elsewhere.
Practical planner
Details to review before reserving
Bring a refillable water bottle and reef-safe sunscreen; refill stations are available and refillable bottles are sold at the gift shop.
Two water bottle filling stations are on-site—guests are asked to avoid single-use plastic bottles and use refillable containers instead.
Some shade is provided, but all participants should wear reef-safe sunscreen for surface time and shore-side exposure.
Review cancellation policies before reserving.
Frequently asked questions
Planning Your Outing
How long is a Lagoon Student Admission session?
The standard session duration is 2.5 hours.
Where do students meet for the Lagoon admission?
Meet at 51 Shoreland Drive, Key Largo, FL 33037.
Who is allowed to enter the lagoon?
Admission is for SCUBA students attending with their SCUBA instructor; instructors attend free of charge.
What training uses are supported at Jules’ Lagoon?
The lagoon can be used for both confined- and open-water training; it has platforms and down lines and reaches depths of 30 feet, and is used by certification agencies for exams.
Are on-site water and refill options available?
Yes—MarineLab Undersea Park provides two water bottle filling stations; guests are encouraged to bring refillable bottles and avoid single-use plastics.
Is Jules’ Lagoon suitable for instructor exams?
Yes—the lagoon and Key Largo Undersea Park are used by organizations such as PADI for exams and have hosted hundreds of new instructors.