Submerged Inc. 12712 Rock Creek Mill Rd Suite 3A, Rockville, MD 20852, United States ProgramsEcologyEmergency TrainingPublic Safety DivingScubaSnorkel DiverSwimServicesBuoyancy CompensatorsDive ComputerDry SuitRegulatorCylindersGas FillsAirArgonNitrox DiveOxygenTrimixEquipmentDive ComputerEquipmentPhoto and Video DivePayment MethodCredit CardDebit CardPayPal Affiliate with Center +1301881-2831 Contact Back Submerged Inc. 12712 Rock Creek Mill Rd Suite 3A, 20852, Rockville +1301881-2831 Email www Opening Hours Mondaynot openedTuesday12:00 - 17:00Wednesday12:00 - 17:00Thursday12:00 - 17:00Friday12:00 - 17:00Saturday12:00 - 17:00Sundaynot opened Email www Upcoming Events Powered by Courses Beginner Courses Advanced Scuba Skills Update It is easy for dive skills to get rusty and to lose confidence when you have not dived for a while. With the SSI Scuba Skills Update, we will get you back in the water and diving with ease in no time. This scuba refresher course allows you to review and practice scuba skills you learned in your Open Water Diver program, under the guidance of an SSI Professional. This is a great course to take just before a dive holiday, so you spend less time worrying about your skills and more time admiring the marine life. If you are a non-certified Open Water Diver student, a Scuba Skills Update is ideal for practicing your dive skills before your open water training dives. With no fixed course duration, you can take your time and focus on the skills you need help with. This course consists of online self-paced review, and a pool session. Dates here are approximate - contact the shop to discuss pool scheduling. July 18, 2026 +4 More $190.00 Enriched Air Nitrox (40%) As a Nitrox diver, you can increase your bottom times and safety margins, plus shorten your surface intervals - so you can spend more time diving and less time waiting! In this program, you will learn new skills and increase your diving knowledge whilst learning how to safely plan and dive with enriched air mixtures of up to 40% oxygen. Upon completion, you will earn an SSI Enriched Air Nitrox 40% certification. Scheduling: Dates on the calendar are approximate - when you sign up for the course, you will receive the online self-study piece. Once you complete that, we will schedule the in-person piece (classroom and practical) August 8, 2026 +3 More $240.00 Perfect Buoyancy The SSI Perfect Buoyancy specialty is the best way to improve your buoyancy and get the most from every dive. Buoyancy is an essential dive skill, but any diver will tell you it takes time to perfect. The Perfect Buoyancy specialty will teach you advanced buoyancy skills and techniques, so you can master your buoyancy more quickly and enjoy more relaxed dive adventures. In this fascinating program, you will also learn new skills that protect the environment and work in every diving situation. Upon completion, you will earn the SSI Perfect Buoyancy Specialty certification. With better buoyancy skills, you will soon be able to hover with ease and take the underwater photographs you dream of! Note: Dates without times are approximate - contact the shop to discuss pool time! August 1, 2026 +2 More $275.00 Frequently Serviced Dive Sites Powered by Lake Hickory Scuba, Inc., 28681 Taylorsville Lake Phoenix (★4.2) This is one of the clearest quarries on the East Coast. Diving here is fun for all levels of divers, with many intentionally sunk objects to explore. Submerged, Inc., 20852 Rockville Lake Allure (★4.1) This is a privately owned dive site in Quarryville, PA close to Lancaster, PA. Register to dive this site at Divepeer.com. Limited number of divers and limited days. Managed by Lancaster Scuba Center. Scubapro, Stephen Frink Millardsville Quarry/Willow Springs (★3.6) Willow Springs Park is located in Richland, PA. It is located about 25 minutes west of Reading. Scuba Venture has divers there on Thursday evenings, and weekends.