Meet the Owners

Bob & Tammy Isham

For a dozen years now, our compass kept pointing back to Isla Mujeres. While our roots run deep in East Tennessee—where you’ll still find us proudly bleeding orange on fall Saturdays for our Tennessee Vols—the moment we first stepped foot on Isla in 2014, we knew we’d found our second home.
After decades of hard work back in Knoxville—Tammy spending over 35 years in healthcare transcription with Covenant Health, and me logging more than 23 years as a lead industrial maintenance technician with DWK—we built our lives around precision, reliability, and taking care of people. When I took my first breath underwater in Cozumel in 2021, my love for the ocean ignited. Dives across the Caribbean and off the shores of Isla quickly turned an adventure into a calling.
When the opportunity arose to take over the dive shop, we didn’t hesitate. We’re channeling that East Tennessee work ethic and southern hospitality directly into the turquoise waters of the Mexican Caribbean. Whether you’re snorkeling MUSA, setting up your first open-water dive, crossing off that magical bucket-list experience of swimming with whale sharks, or drifting over Manchones reef, we treat you like family the second you walk through our doors.

THE AQUA FAMILY

Jessica Montejo

Manager

Jessica grew up in Belize in a family of tour guides, where hospitality and ocean life were part of everyday life. She took her first dive at just 11 years old, beginning a lifelong connection to the sea.
With a degree in Tourism Management and Marketing, Jessica combined her passion for

the ocean with a strong foundation in business operations. While many follow the instructor path, she found her calling behind the scenes — managing daily bookings, coordinating schedules, and ensuring every detail runs smoothly.
As General Manager, she oversees reservations, logistics, and team coordination, making sure each dive experience is organized, safe, and seamless. Although her role is primarily operational, she occasionally wets her fins to stay connected to the underwater world that first inspired her.

Wilbert Chunab “Capi”

Captain & divemaster

Wilbert has been a cornerstone of Aqua Adventures since the beginning. He started his journey with us as a Divemaster and, through dedication and experience, evolved into the exceptional Captain he is today.
Coming from a proud Isla Mujeres fishing family, the ocean is part of who he is. He

knows these waters above and below the surface with remarkable familiarity, bringing confidence and stability to every trip. His ability to read the sea, anticipate conditions, and make sound decisions ensures each dive operates smoothly and safely.
When the surface marker appears, Wilbert is already attentive and ready. His steady presence on the boat has earned the trust of both our team and our guests.
Beyond his professionalism at sea, Wilbert is a welcoming and familiar face for returning divers — a devoted husband, father, and a true pillar of our dive family.

Sebastian Koster “Sebas”

PADi scubadiving instructor

Sebastian’s dive journey began in Koh Tao, Thailand, in 2019. What started as an adventure quickly grew into a true calling. After completing his Open Water, Advanced, and Rescue certifications, he realized he wanted not only to dive — but to teach and inspire others.

That path eventually brought him to Isla Mujeres, where he completed his PADI Divemaster and Instructor training and became part of the Aqua Adventures team.
Sebastian is known for his calm energy, patience, and ability to make divers feel at ease in the water. As a PADI Specialty Instructor, he enjoys helping students refine their skills, build confidence, and expand their underwater experiences.
Whether guiding certified divers or teaching a first-time student, Sebastian focuses on creating safe, relaxed, and memorable dives that encourage growth and exploration.

Javier Alvarez “Javi”

PADI scubadiving instructor

Born in Argentina in 1993, Javier has been sharing his passion for diving in Isla Mujeres since 2022. As a dedicated PADI Instructor, he guides divers of all levels — from Discover Scuba participants to advanced certifications — with professionalism and patience.
Known for his calm teaching style and strong

focus on safety, Javier helps students feel confident and relaxed underwater. He has a particular interest in buoyancy control and skill refinement, believing that strong fundamentals create exceptional divers.
With a background in Environmental Sciences, he incorporates ocean awareness and responsible diving practices into every course and experience.

Alejandra Nieto

Office Assistant

From the Gulf of Mexico to the Caribbean, Alejandra’s connection to the ocean has shaped her journey. Born in Veracruz, she has always felt at home near the sea. As she says, “Wherever the ocean is, that is where I belong.”
With a degree in Business Administration

in Tourism, Alejandra combines her passion for the marine world with strong organizational skills. She manages reservations, assists with scheduling, and supports daily operations to ensure every guest experience is smooth from the first message to the final dive.
Her attention to detail and dedication to hospitality are key to the seamless experience we strive to provide.

Jonathan Zapata

PADi scubadiving instructor

Jonathan is a proud island native whose life has always been connected to the sea. From a young age, he was fascinated by the caves, reefs, and marine life surrounding Isla Mujeres.
Three years ago, he turned his lifelong passion into a profession, becoming a diver to explore the underwater world more deeply. Sharks,

fish, octopus, and corals continue to inspire him with every dive.
In addition to guiding, Jonathan plays a vital role in equipment care, boat upkeep, and general maintenance, helping ensure operations run safely and efficiently. His hands-on knowledge both above and below the surface makes him an essential part of the team.

Our dive center is proud to be highly rated on TripAdvisor and Google

      EXCELLENT  
   Based on 293 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Bob Isham 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very professional and knowledgeable staff.  Everyone was very friendly and efficient, i recommend to anyone looking for dives, snorkeling, whaleshark tours and anything else they do, they were top notch!
  
 
      Posted on Google  
   
   KS S 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had a fantastic time learning the basics of scuba diving from a wonderful instructor, Sebastian! Everyone at the shop was super friendly and helpful! This was an amazing experience and we hope to be back again!
  
 
      Posted on Google  
   
   Robert Ashford 
 
 
 
 Trustindex verifies that the original source of the review is Google. A phenomonal experience from start to finish. Jessica in the office was amazing and made booking and communication a breeze. My certification instructor (Javi) was patient and got me through OW training without issue. Highly recommend and I cant wait to dive with them again and again anytime I am on the Island!
  
 
      Posted on Google  
   
   Brian Doyle 
 
 
 
 Trustindex verifies that the original source of the review is Google. We joined them for whale shark tour and a diving trip.  Both were amazing!  Jessica in the shop was great.  For the whale shark tour we had Jair and Victor.  They did a fantastic job.  When we were diving , we went with Javier, Sebastian, another gentleman and the captain Wilber (may have the name wrong).  All great people, professional, and enjoy what they do.  Would highly recommend to anyone.
  
 
      Posted on Google  
   
   Curtis Prior 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had an amazing experience diving in Cancun and couldn’t have asked for a better introduction to scuba diving. The day started with a learning session and skills test, followed by two incredible dives, and the entire experience exceeded my expectations.

A huge thank you to Sebastian, our diving instructor, who was absolutely fantastic. As first-time divers, we were naturally a little nervous, but Sebastian was incredibly patient, caring, and thoughtful throughout the entire experience. He always made sure we were comfortable, regularly checked that we were okay, and adjusted the pace to suit our confidence and ability levels.

What really stood out was how supportive and encouraging he was, helping us feel safe and relaxed underwater. He also captured some amazing videos for us, allowing us to relive some truly special moments from the dives.

Sebastian’s professionalism, kindness, and attention to detail made the experience so much better than we could have imagined. I would highly recommend this diving company to anyone, especially beginners. Thank you for helping make our first diving experience such a memorable one!
  
 
      Posted on Google  
   
   Josh 
 
 
 
 Trustindex verifies that the original source of the review is Google. Went diving on Saturday 20th June 2026, from the moment we entered the shop nothing but welcoming from all the team at Aqua. Very quickly met our dive master Sebastian who made us feel at ease straight away. Taught us all we needed to know to make the dive as smooth as possible.

Throughout the two dives we completed Sebastian kept making sure we was okay and comfortable making the experience so amazing. Got to see a lot of different types of fish including barracuda’s.

Thank you Sebastian and the team for making the day so amazing. Can’t wait to come back again.
  
 
      Posted on Google  
   
   Jeffrey Zehngut 
 
 
 
 Trustindex verifies that the original source of the review is Google. Incredible experience diving with Aqua Adventures! From the second you walk in the door you are truly part of the family. Javier and Guillermo were amazing dive masters and Jessica was wonderful to work with at the front desk. We did five dives in two days and each was better than the last. Javier also took us on a magical night dive full of life and bioluminescence! It felt like floating through a galaxy of stars. We cannot wait for our next visit and will absolutely dive with Aqua Adventures again! Gracias por todo!
  
 
  
  
 
     Verified by Trustindex  Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more

  Amazing Experience - We had a fantastic experience learning the basics of scuba diving (with lots of help from our very patient and encouraging instructor, Sebastian)! The underwater world we saw was so... read more

Karen S
June 25, 2026

  The best company to go diving with! - I had an amazing experience diving in Cancun and couldn’t have asked for a better introduction to scuba diving. The day started with a learning session and skills test, followed... read more

curtisp704
June 22, 2026

  Amazing - I Always wanted to scuba dive and after learning a cert was not needed, I just had to try it out. Jessica was very informative and advised to change the... read more

Anthony G
June 21, 2026
  Great experience - Great experience scuba diving with Sébastien! He was patient and calm and a great guide. Also, we saw beautiful fish, a stingray and a baby nurse shark 🙂 The underwater... read more

Lauren_E_Seibert
June 19, 2026

  Nice reef dives and Excellent service - Great dives and the service was outstanding. Javi, Bruno and Guille were awesome!

John M
June 3, 2026

  Fantastic. - This is a very friendly shop. The whole itinerary is two days for two confined water training and four open water dives. Unfortunately my last two open water dives were... read more

Guangming L
January 17, 2026