In the rule “The Chambers”, replace “When a Hive Proposal enacts, every Infected whose vote for the Proposal was FOR becomes an Occupant of that Chamber, and ceases to occupy any Chamber they were occupying previously.” with:-

If an EVC on a Hive Proposal includes the word “Dig” it is a Dig Vote, otherwise it is not. The Alien’s Vote is always a Dig Vote. When a Hive Proposal adds or modifies a Chamber rule, every Infected whose vote for the Proposal was FOR and also a Dig Vote becomes an Occupant of that Chamber, and ceases to occupy any Chamber they were occupying previously. If a Hive Proposal enacts with no Dig Votes which are also FOR votes, its proposed change to the ruleset does not occur.