Before revision:  The reduced activity is observable from March to June, when the most severe restrictions were in force , producing a variation of mobility quantified between -5.62\% and -13.77\% for container ships, between +2.28\% and -3.32\% for dry bulk, between -0.22\% and -9.27\% for wet bulk, and between -19.57\% and -42.77\% for passenger shipping. The presented study is unprecedented for the uniqueness and completeness of the employed AIS dataset, which comprises a trillion AIS messages broadcast worldwide by 50000 ships, a figure that closely parallels the documented size of the world merchant fleet.
After revision:  The reduced activity is observable from March to June, when the most severe restrictions were in force , producing a variation of mobility quantified between -5.62\% and -13.77\% for container ships, between +2.28\% and -3.32\% for dry bulk, between -0.22\% and -9.27\% for wet bulk, and between -19.57\% and -42.77\% for passenger traffic. This study is unprecedented for the uniqueness and completeness of the employed AIS dataset, which comprises a trillion AIS messages broadcast worldwide by 50000 ships, a figure that closely parallels the documented size of the world merchant fleet.