# 161: Index O

Oatso Simple
  Large SW-trending tube at start of Chile in Steinschlagschacht (1999)
Oldham Pitch
  First pitch of Flat Battery, before PP3 (1990)
Olympus
  Area of horizontal passages off west from Tower Blocks, also spelt Olypus due to initial writo (1988-1989)
Oral Series
  Rift pitch series down from Dreaming of Limo (1995)
Orchestral Pit
  Lower chamber below The Theatre in Steinschlagschacht (1997)
Orient Express
  48m Pitch below Algeria in France (1992)
The Oubliette
  Short pitch below Butcher in Left Hand Route (1988)
Outright Rejection
  16m fourth pitch of Interview Blues (1996)
The Overflow
  Waterfall (good carbide filler) marking change from Triassic Park I to Triassic Park II (1995), and the short pitch series below this (1998)
The Overshoot
  Large hading passage trending SW beyond Oatso Simple in Chile (1999)
Over the Rainbow
  Complex widening of Chunnel at traverse over Rainbow Pitch in Right Hand Route (1988)