There are probably several more records that I could give for UK caves, but this is intended to be a comparison between the records held in the UK and overall World records and I cannot get the corresponding records for World Caves.
| Topic | World Record | UK Record | ||
|---|---|---|---|---|
| Longest Cave | Mammoth Cave - Flint Ridge - Proctor - Roppel, USA |
652 km | Three Counties System | 87 km |
| Deepest Cave | Krubera-Voronja, Georgia (Europe) | 2197 m | Ogof Ffynnon Ddu | 308 m |
| Biggest Chamber By Volume | Miao Room, Gebihe System, China | 824 m long x 336 m wide (max) x 177 m high (max) or 252 m high (total), area 140540 m2, volume 10780000 m3 | Main Chamber, Gaping Gill | 136 m long x 46 m wide (max) or 27 m wide (normal) x 49 m high, area 2729 m2, volume 43071 m3 |
| Biggest Chamber By Area | Sarawak Chamber, Lubang Nasib Bagus, Malaysia | 641 m long x 429 m wide (max) x 113 m high (max) or 316 m high (total), area 154530 m2, volume 9640000 m3 | The Frozen Deep, Reservoir Hole | 71 m long x 79 m wide (max) or 40 m wide (normal) x 52 m high, area 2981 m2, volume 39328 m3 |
| Biggest Passage | Main Chamber (passage), Gua Payau, Malaysia | 174 m wide x 122 m high (though typically 91 m x 91 m) | Time Machine, Daren Cilau | 20 m wide x 25 m high |
| Hang Son Doong, Vietnam | 91 m wide x 244 m high (though typically 80 m x 80 m) | |||
| Highest Pitch | Vrtiglavica Vertigo, Slovenia | 643 m or 603 m depending on definition | Titan, Peak Cavern System | 145 m |
| Highest Unbroken Pitch | Miao Keng, China | 501 m | Titan, Peak Cavern System | 141.5 m (but usually rigged in two parts) |
| Longest Underwater System | Sistema Sac Actun, Mexico | 335 km (some above water) | Keld Head, Kingsdale Master System | 6.7 km |
| Deepest Underwater System | Pozzo del Merro, Italy | 392 m | Sump 24, Wookey Hole | 90 m |
| Longest Sea Cave * | Matainaka Cave, New Zealand | 1.54 km | West Bay Cave, Fogla Skerry, Shetland Islands | 400 m |
| Deepest Sea Cave * | Devil's Limekiln, UK | 79 m | Devil's Limekiln | 79 m |
| Halvikshulen, Norway | 80 m (entrance height, not actual passage depth; now a fossil cave) | |||
| Most Well Decorated Cave | Lechuguilla (pronounced "Lesha geeya"), USA | Otter Hole | ||
* Including only caves formed by wave action. Excluding blue holes and other submerged solutional caves, as these are not true sea caves.