 Hi dear friends, we are from the enemy Munich Germany and I'm glad to present you our study on chloroflexi from the North Atlantic Abyssal line. The North Atlantic gyre is one of the least productive regions of the global ocean and because the organic matter produced on the surface is mostly consumed during sinking, the deep biosphere of the abyssal seafloor experience is extreme energy limitation over the long term. For this study we retrieved three cores from 5000 meters water depth in the North Atlantic where sediment deposition is minimal. Depending on local sedimentation rates the sediment can remain oxy down core or rapidly turn anoxic in the shallow surface. Abyssal communities are generally very rich in chloroflexi indicating that this phylum may drive key processes in the global seabed. Our sequencing results reveal a high diversity of uncultivated clades among chloroflexi with different assemblages in oxy and anoxic settings respectively. In oxy red clay chloroflexi die off over 10 million years even though the relative abundance is proportionally increased down core. In anoxic clay chloroflexi grow slowly down to a depth of five meters and the relative abundances remain rather constant. Our metagenomic and transcriptomic data highlight which metabolic features anaerobic and anaerobic chloroflexi to persist in abyssal sediments. For instance anaerobic chloroflexi express a partial woodland out pathway coupled with hydrogen productions and electron defecations. Our study shows for the very first time that homoacetogenic chloroflexi actively grow and divide in these million years old anoxic clay. If you want to learn more about this intriguing chloroflexi that colonize the abysses please visit FEMS website. Thank you very much.