1 | CLASS I — A SINGLE ENTRANCE CREATED FROM A GAP IN THE BANK | John Chantler / Steve Noble / Seymour Wright | 2:15 |
2 | CLASS II — TWO ENTRANCES, DIAMETRICALLY OPPOSITE EACH OTHER | John Chantler / Steve Noble / Seymour Wright | 7:10 |
3 | CLASS III — FOUR ENTRANCES, FACING EACH OTHER IN PAIRS | John Chantler / Steve Noble / Seymour Wright | 11:32 |