The government of Tanzania constructed a National ICT Broadband Backbone (NICTBB) connecting all Regions in Tanzania and cross-border connectivity to Zambia, Malawi, Kenya, Uganda, Rwanda and Burundi. The NICTBB has a total length of 7,910 Km. The aim of NICTBB is to provide connectivity to all neighbouring countries. Now the government is planning to connect with DRC by construction of optical fiber cable. The ideal of connection is between Kigoma in Tanzania and Kalemie in DRC, where the submarine optical fiber cable will be constructed. To achieve direct cross border link across lake Tanganyika requires understanding of lake Tanganyika’s bottom terrain and hydrology, landscape of beach sides, assessment of risks for marine activity and analysis of environmental factors for an in-depth design.