Would you say:
The earliest stage of network design is the burial of optical fibers.
To say that the first stage, when you design an optical network, is to put the fibers under the ground ?
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the act or ceremony of burying Dictionary.com
And burying is:
to put in the ground and cover with earth Dictionary.com
Which is what they're doing, so it's fine. The confusion probably arose from the second definition,
to put (a corpse) in the ground or a vault, or into the sea, often with ceremony
But people should know what you mean when you bury cables.