Explore America’s
Underground Adventure
Paddle through a historic flooded sand mine and cavern system on guided canoe and kayak tours the whole family will never forget. Discover towering pillars and crystal clear water deep below the surface.
- Guided canoe & kayak tours in an underground lake system
- Family-friendly adventures, group events, and private tours
- Conveniently located in Crystal City, Missouri
Welcome to Crystal City Underground
Beneath the hills of Crystal City lies a vast, awe-inspiring world. Formed decades ago as a premier sand-mining quarry for Pittsburgh Plate Glass, this massive labyrinth has transformed into a spectacular flooded underground lake system.
Today, Crystal City Underground preserves this unique slice of Missouri's industrial history, offering safe, guided adventures for explorers of all generations. Our tours let you paddle amidst towering columns of solid rock, experience absolute quiet, and admire the beautifully lit sand-mine architecture.
Who is this adventure for?
Proudly sharing Missouri's natural treasures for over a decade.
Explore the mysterious flooded passageways safely under professional guidance.
Underground Adventures & Experiences
We offer multiple ways to explore our ancient flooded query. Review our standard offerings below and reserve your experience.
Guided Canoe Tours
A scenic 1.5-hour tour focusing on quarry history and geological features. Ideal for couples, parents with younger children, and beginners.
Guided Kayak Tours
Navigate the tighter cave slots and hidden mineral springs in a sleek single kayak. Offers maximum speed, agility, and a closer connection to the water.
Group & Private Events
Book the entire mine lake for birthdays, corporate team builders, school tours, scout outings, and church gatherings. Catered packages available.
Seasonal Glow Tours
Our special glowing-canoe night adventures. Glide in the dark with underwater color-changing lights and luminous shoreline landmarks.
See What’s Happening Underground
We maintain an active online community detailing water levels, seasonal scheduling, and latest visitor memories. Keep tabs below.
Crystal City Underground
Official Community Update Stream
🌅 Glow Tour announcement! We have added 5 new slots for our Friday night neon-glowing kayak expedition next month. The clear water conditions this week are breathtaking—check out these shots taken by Eric on Tuesday! Remember, the cavern stays a comfortable 55°F so bring a light sweater.
Excellent news! The water clarity levels are optimal this week. Our main reservoir lake depth is steady at 12 feet, allowing perfect navigation through our historical sand-mining channels. Tom and Kathy will be leading the weekend family tours, make sure to say hello and ask about the historic 1900s mining equipment still visible!
Find Crystal City Underground
Located just 45 minutes south of St. Louis, we are easily accessible from Highway 61/67. Review our travel parameters to guarantee a smooth arrival.
Physical Location
Crystal City Underground
700 Crystal Ave
Crystal City, MO 63019
Phone: (636) 937-2628
Email: eric.stern28@gmail.com
Important Arrival Tips:
- Arrive Early: Please arrive 20 to 30 minutes before your scheduled tour to sign safety waivers and get fitted for life vests.
- Parking: Free designated gravel parking is available directly outside the main cavern entrance gateway.
- Attire: Cavern maintains 55°F all year round. Wear warm layered clothing and shoes that you don't mind getting slightly damp.
Plan Your Underground Adventure
Complete the form below to request tour availability or obtain details on custom corporate events and big-group birthday bookings.
Booking Request Sent!
Thank you! Our crew will contact you soon to confirm water levels, available times, and lock in your reservation.