Survey Index I
| CAVE | REGION/EXTENSION | REFERENCE |
|---|---|---|
| Ibbeth Peril System | 115:33, 127:9 | |
| Ilam Main Rising | 37:47 | |
| Illusion Pot | Dale Barn Cave connection | 161:12 |
| Burnell Rift rigging topo | 303:17 | |
| India | Mawmluh, Krem | 113:32 |
| Meghalaya area map | 113:31, 158:27 | |
| Puri, Krem | 260:23 | |
| Ribung Kung 1 & 2, Meghalaya | 303:21 | |
| Indo-Pacific Islands | area map | 100:21 |
| Ingleborough Cave | 160:18 | |
| Foot and Mouth Passage | 162:10 | |
| historical survey | 165:28-9 | |
| hydrology | 242:26-7 | |
| The Cave Book 1938 survey | 272:26 | |
| Intake Dale Mine | 274:10-11 | |
| Iran | Ali Sard Cave | 20:18 |
| Ghar Alisadr | 165:31 | |
| Ghar-e-Danial | 207:35 | |
| Ghar-e-Dosar | 232:30 | |
| Koona Koter | 20:17 | |
| Sar-Ab Cave | 20:17-18 | |
| Ireby Fell Cavern | 159:21, 215:24-5,26 | |
| Bubbles Route | 191:14 | |
| Cripple Creek | 205:26,27 | |
| Duke Street Sump | 195:13 | |
| Upstream Duke Street | 230:12 | |
| Ireby Fell Cavern/Notts Pot | 87:10, 215:24-5 | |
| hydrology | 83:6 | |
| Ireland | limestone and cave distribution | 261:30 |
| Irian Jaya | area map | 96:21, 110:26 |
| Isca Silurum Tunnels | 73:18 | |
| It’s a Cracker | 227:21, 236:32,33 | |
| Italy | Corchia, Antro del | 9:23, 23:5 |
| Corchia, Antro del, hydrology | 37:27, 41:8 | |
| Monte Novegno, Abisso di | 127:27 | |
| Piaggia Bella | 33:31 |