Survey Index O
| CAVE | REGION/EXTENSION | REFERENCE |
|---|---|---|
| O’Flaen-y-Waun, Ogof | 117:11 | |
| Oblivion Rift Cave | 257:14 | |
| Oddmire Pot | 248:334-5 | |
| Ofapi Pot | 141:10 | |
| Ogof Capel | 69:9, 77:17, 78:17 | |
| Ogof Capel Faen | 284:10 | |
| Ogof Carno | 182:21 | |
| 1991 Series | 102:21, 103:34 | |
| Blight of the Fumble Bee | 112:17 | |
| Dill and Imaginary Menagerie | 182:22 | |
| extensions 1992 | 106:8 | |
| High Anxiety | 109:8 | |
| Littoral Zone | 111:26 | |
| Open Season & The Precious Years | 105:21 | |
| Poseidon Series | 166:24 | |
| Space Oddity | 116:25 | |
| True Grit | 116:25, 120:12 | |
| Ogof Cil yr Ychen | 84:16,17 | |
| Ogof Corryn Cawraidd | 91:33 | |
| Ogof Cragen | 177:20-1 | |
| dye-traces | 177:20 | |
| Ogof Craig a Ffynnon | area map | 38:23 |
| hydrology | 61:20-1, 76:20-1 | |
| Ogof Cwbl Hardd | 95:23 | |
| Ogof Cynnes | 112:30 | |
| shakeholes near | 100:42 | |
| Ogof Dan-y-Lleuad Wen | 104:35, 113:11 | |
| Ogof Ddwy Sir | 140:35 | |
| Ogof Draenen | 121:23, 122:21, 132:22, 163:37, 189:8 | |
| area map | 121:22 | |
| Big Country | 127:34 | |
| Bit of a Dive | 123:22 | |
| Dollimore Series | 134:21,22 | |
| Entrance series | 119:12, 121:25 | |
| Galera Garimpeiros | 124:31 | |
| Hexamine Highways | 131:35, 132:10 | |
| location survey | 143:20 | |
| Lucky Thirteen | 124:32 | |
| Prisoners of War | 143:21 | |
| Republican Plot | 163:36 | |
| round-trip connection | 122:23 | |
| Score, The | 123:22 | |
| Sleepcrawler Series | 131:10, 132:21 | |
| Snowball Series | 125:29 | |
| St Giles | 125:29 | |
| War of the Worlds | 131:10, 132:21 | |
| Waterfall Series | 129:27 | |
| Wyvern extensions | 127:34 | |
| Ogof Fawr | 201:22 | |
| Ogof Ffynnon Ddu | Aven 2 (OFD 3) | 278:25 |
| Nant Gam Choke | 184:15 | |
| OFD1 to OFD2 underwater connection | 135:21 | |
| The Smithy and surrounding area | 247:38 | |
| The Wee | 278:26 | |
| Top Entrance to Gnome Passage and surrounding area | 247:39 | |
| Outline survey of Smithy rescue route | 284:24 | |
| Ogof Ffynnon Taf | 70:11, 84:14, 139:15 | |
| area map | 84:15 | |
| Ogof Foel Fawr | 86:31 | |
| Ogof Glan Gwenlais | 66:14-15 | |
| area map | 91:22 | |
| Ogof Gwynt yr Eira | 129:34 | |
| hydrology | 129:35 | |
| Ogof Igam Ogam | 83:18 | |
| Ogof Marros | 248:23 | |
| Ogof Mynydd Llangynidr | 114:14 | |
| Ogof Nant Hyfryd | 94:25 | |
| Ogof Nant Rhin | 111:22 | |
| Ogof New Park | 304:29 | |
| Ogof O’Flaen-y-Waun | 117:11 | |
| Ogof Pant-y-Llyn | 60:19 | |
| area map | 91:22 | |
| Ogof Pasg | 86:31 | |
| Ogof Pen-y-Craig | 84:14 | |
| Ogof Pwll Swnd | 88:24 | |
| Ogof Pysgodyn Gwyn | 6:19 | |
| Ogof Rhaeadr Ddu | 63:22 | |
| Ogof Swn y Mor | 277:27 | |
| Ogof Triachwech | 179:23 | |
| Ogof yr Uwd Lwyd | 187:27 | |
| Oonaglour | 143:33 | |
| Otter Hole | 32:23, 56:20-1 | |
| Hall of 30 | 113:17 | |
| Our Lady’s Cave | 169:28 | |
| Outlands Head Quarry Cave | 88:16 | |
| Ovens Cave | 144:14 | |
| Owl Cave | 25:11 | |
| Owl Hole | 184:31 | |
| access route | 114:10 | |
| Oxlow Caverns | area map | 96:12 |
| Crusader Extensions | 240:32,33, 243:8 | |
| hydrology | 49:39 | |
| with Giant’s Hole | 240:33 |