Missouri (Ozarks)
Cannonball Cave
Info · exploration
Information only: an exploration project of Mike Young and the KISS Rebreathers team. No source says the cave is open to visiting divers.
- Max depth111 m (364 ft)
- CertificationFull cave
- SpecialExperienced divers
Diving and fills
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Now at Cannonball Cave
The dive
You enter through a low entrance, one by one, and then a wide passage with a pit opens up. Visibility is near zero at the entrance and improves further in.
Profile and sections
You enter through a low entrance, one by one, and then a wide passage with a pit opens up. Visibility is near zero at the entrance and improves further in.
Mike Young of KISS Rebreathers has been exploring the cave since 2022 with a team of about fifteen. At ~87 m a high-flow restriction stops the team; whether it can be passed depends on the season. The goal is to find the larger passage that feeds the water. Texas A&M University does biological research here.
Practical: information only.
- Depth and profile
- Down to 111 m; ~603 m explored, one entrance; a high-flow restriction at ~87 m (InDEPTH 2026).
- Configuration
- Deep expedition dives on rebreathers with powerful scooters, staged bailout and a deco habitat.
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR
- Configuration unknown — research beforehand
- Goes down to 111 m (trimix or deco may be needed)
- Experienced divers only
This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.
How to get there
In south-east Missouri, near Lake Wappapello: the entrance lies a few metres off the lake shore, under water (2015 blog).
Around Cannonball Cave
FillsNo fill station known nearby
News
Access and rules change: check what applies locally right before your trip. Source: GDELT Project and the news feeds of diving magazines. Search for more news ↗ Searched automatically, last on 11 Nov 2026.
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