H. Rept. 115-918: Maritime Border Security Review Act, Report to Accompany H.R. 5869, Including Cost Estimate of the Congressional Budget Office, September 4, 2018 [open pdf - 215KB]
From the Purpose and Summary: "The purpose of H.R. 5869 is to require the Secretary of Homeland Security to conduct a threat analysis of the United States maritime border."
H. Rept. 115-918; House Report 115-918
Government Publishing Office: http://www.gpo.gov/