Eisehhower memorial tunnel 8-foot hole connecting 2 portals completed. RMN Ap 10, 1971 p.93 working conditions in tunnel unsafe for crew. 1971 p.1 Main bore is two-thirds finished.. RMN D 9, 1971 P.11 Blast danger found in tunnel; danger removed. Post D 14, 1971 P.1 RMN D'5,,, 1971 p.5 Large exhaust fan back in service; Colorado Bureau of Nines makes unannounced inspection. 1971
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