About Sharky

What Our Divers Say

I must say WOW! Being an experienced diver, I did not expect such a wonderful tour coming! I loved it. Thanks a lot. Me and my friends had a lot of fun, learned some new techniques and saw amazing places. Great job!

Kelly Joel
Kelly Joel

Summer is a joyful season, the one that is absolutely perfect for traveling, falling in love and of course for diving! Book the best tour and find the perfect diving spot with the help of professional instructors!

Caren Page
Caren PageStudent

No matter how far you have to travel to try it, diving is absolutely worth it! Thank you for making my vacation truly unforgettable. I enjoyed every moment of it, and I do appreciate your assistance with all the arrangements.

Monica Barton
Monica BartonModel

About Capt. Mark “Sharky” Alexander

Captain Mark “Sharky” Alexander started diving nearly 25 years ago as a Public Safety Diver for the Springfield/Sangamon County ESDA rescue squad in Illinois. Sharky is an active recreational, technical, and closed circuit rebreather instructor and expedition leader, arranging and coordinating exploration expeditions around the world.

Sharky holds the following active credentials:

  • PADI Master Instructor: Open Water, Advanced, Specialties – Nitrox, Buoyancy, Night, Wreck, Deep, Navigation, Medic First Aid
  • TDI Instructor: Inspiration Classic/Vision CCR Instructor and Advanced Nitrox / Decompression Procedures
  • IANTD CCR Normoxic Trimix Instructor
  • EFR Primary Care (CPR) & Secondary Care (First Aid) Instructor
  • DAN Oxygen First Aid Instructor
  • Advanced Diver Medical Technician
  • Hyperbaric Chamber Technician
  • USCG 100 Ton Master Captain License with Towing Endorsement

When Sharky is not diving he works full time as a paramedic, and as an instructor for EMT and Paramedic training courses. He instructs in areas of Advanced Cardiac Life Support, Pediatric Advanced Life Support, Advanced Pre-Hospital Trauma Life Support and Advanced Hazmat Support. He is on staff with Cardinal Glennon Children’s Hospital in St. Louis as a Pediatrics Advanced Life Support Instructor.

In January 2018, Sharky and Matt Savatski became the new owners of the Ultimate Getaway / Global Explorer Liveaboard.  They run 3-4 day and 4-5 day dive trips to the Dry Tortugas and Middle Grounds.

In September 2010, Sharky retired from the Illinois Air National Guard, with 20 years of service as an F-16 Aircraft Weapons Specialist. He served four tours in the Middle East, including in Kuwait, Saudi Arabia, Qatar and Balad, Iraq.

Sharky’s Underwater Expeditions was founded in 2007, and focuses on advanced dive travel, deep wreck exploration, specialized technical training and closed circuit rebreather training. Sharky specializes in closed circuit rebreather training and mixed gas training, as well as functioning as a dive medical officer, and offering medical seminars on remote medical treatment and logistics.