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Bentonite is a natural clay mineral that has the property of swelling upon hydration (mixing with water). When space for free swelling is limited in the presence of water, a dense gel is formed that prevents further moisture penetration. It is the standard for use in tunneling and well drilling. TUNNEL-GEL PLUS thickener provides rapid development of viscosity and maintenance of stability of the borehole walls, and also effectively reduces filtration of drilling fluid into the soil. Application and purpose: Effective soil removal and excellent suspension properties of the solution; Control of solution filtration into the soil and consequently stability of the borehole; Effective lubricating ability of drilling fluid in microtunneling operations. Advantages of TUNNEL-GEL PLUS from Baroid: Increased viscosity in fresh water; Easily mixed and quickly reaches maximum viscosity; Increases lubricating ability of the solution to reduce required pulling force; Preparation of more than 2 times more drilling fluid of similar viscosity at the same concentration compared to API standard bentonites. Recommendations for using TUNNEL-GEL PLUS: To increase efficiency of using