Survey Title: [no title]
Surveyor(s): Bowen, G.B. and Weaver, C.P.
References: Brit Cav 5,32 (1940)
Notes: Plans and sections of tunnel and chambers beyond the Drainpipe. Line-cuts by G. Platten from rough drawing be G. Bowen and C.P. Weaver, 1938
Additional Notes: Also published in MNRC Report for 1938. Key is printed on p.31