An interview on some of the engineering considerations of boring through chalk.
Unissued / unused material - dates and locations may be unclear / unknown.
MS Mr Harold Harding seated at desk giving an interview, answering questions about the Channel Tunnel Project, the tunnel's width and type of machines to be used, etc. He talks about rotary bores, about 7 metres in diameter, being used to tunnel through chalk and using injections to close fissures ahead of the boring.
Note: Date on original record: 23/09/1963. Interview is out of sync by about 16 frames. Location is probably Britain or France. Old records list him as John Harding, though this is in fact Sir Harold Harding.