Explanation:

 The Department of Biotechnology will commission a two-tiered barge that will roughly be the size of two large conference rooms and host scientists and a full-fledged lab that will allow those on board to collect samples from various stretches of the river, perform tests on water quality and biodiversity of the wider ecosystem. The proposed vessel, now only known as the Brahmaputra Biodiversity Biology Boat (B4), would also be linked to smaller boats and research labs.