Olympia: The Age of Gods PBEM (Oct 4 2000)
Time to learn: 21 days. Time to use: 7 days. Requires: ten workers [11] (not consumed) Requires: 25 wood [77]
Use of this skill adds wooden shoring to a mine shaft. Normally the chance each month of a cave-in in a mine shaft is (depth/300)%. Wooden shoring reduces this chance by 2.3%.