18.104.22.168 Not unlimited, but more than 1 unit can intercept in each hex.
Within the same hex or Sea Zone, more than one interception can be made against the same phasing unit. During an Amphibious Invasion, only one interception per Sea Zone or invasion hex is allowed (22.214.171.124).
Each interception is resolved separately and must be done by a different non-phasing unit. The non-phasing faction must resolve one interception before declaring another.
A non-phasing unit can make more than one interception in a Phase. However, within a single hex or Sea Zone, it cannot intercept the same phasing unit more than one time during that unit’s Action.