Tubes are most efficient transport options. Grow a mustache and jump into a pipe today!
Tube Travels are the 10th Land industry. They only require 100 B Airports to unlock but a x524,288 crit power may be required to afford them easily. Also, the ridiculously high generator cost of 100 BB Airports may force those without a level 3 Mega Tron to skip the first tube travel mission at Rank 87. Jimmy Astroseed automates this industry and will unlocked at Rank 88.