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Explanation: IMO, it's referred to a backup network, not enabled in normal operation, and enable to work in case of some abnormalities.
See follows for reference, though I don't agree with "invisible web"
或不可见网络或深网(deep Web)。 ... engine.cqvip.com
Adsion Canada Local time: 18:10 Works in field Native speaker of: Chinese PRO pts in category: 20
6 hrs confidence:
Explanation: Possibly a little more natural sounding than 'hidden network'. 'Undercover network' sounds good too.
Protecting SSL Communications from Concealed Network Attacks.
Hamish Young New Zealand Local time: 10:10 Native speaker of: English PRO pts in category: 8