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He's holding a "mouse" which fits neatly into the duct

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The the "mouse" is attached a nylon line and the "mouse" is blown through the duct by compressed air.

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Out the other end it comes (the other end is attached to a cable and this is winched through).

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The cable, now joined to the telephone cable, is run through this flexible guide which is plugged into the duct.

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At the drum end the cable is greased as it feeds into the guide.

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The cable appears (extreme right duct)

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Then begins the very complex job of joining wires

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The cable is winched through the duct with the aid of this periscope.