Cape Banza hot vents and chimneys. Chimneys exhibition
The Cape Banza hydrothermal site has not been sampled for biological material this time. However, the beauty of this site deserves to be shown. The site consists of 72 active vents and several tens of fossil vents, at between 0 and 6 meters depth ( refs.3-6 ).   These vents are characterized by single-orifice chimneys from 1 to ~20 cm in height and 2 to 5 cm in diameter, or by multiple orifice chimneys up to 70 cm high.	Chimney with a diver's knife to provide a scale A multiple orifice chimney "Cathedral" is a multiple-orifice aragonite chimney developed at shallow depth (~1 m)
A multiple orifice Chimney A small isolated chimney . Hot fluid outflow can be easily seen	Hot fluids pour out of the chimneys at temperatures between 66 and 103°C at an estimated flow rate of 1 to several liters per second. Mouths of the chimneys are abundantly covered with bacterial colonies forming white filaments, called mats.
More close-ups and details of bacterial mats
The Cape Banza site has already been explored by the previous TANGANYDRO '91 expedition ( ref.10), and samples of fluids and sediments revealed the existence of thermophilic sulfate reducing microorganisms morphologically similar to Desulfotomaculum species( ref.11). Lake Tanganyika contains a unique fauna marked by a high degree of endemism ( ref.7 ), and can be compared with Lake Baikal, where Beggiatoas-like bacterial mats have already been described ( ref.9 ), as well as at the deep-sea Guymas vent site (Gulf of California, Mexico. Ref.8 ).	Small chimney close up of the "Cathedral" with white bacterial filaments growing on the inner walls Large filamentous bacterial mat at the edge of block on the lake floor Detail of the white filamentous mat