Pertamina workers in the East Tapian oil field's red zone went about their business as normal on Thursday last week. At the field, part of the Tanjung Block in Tabalong regency, South Kalimantan, they checked wells and inspected crude oil production before channeling the valuable material to the storage tank station. Pumping units were operating at eight wells owned by Pertamina Unit Bisnis Eksplorasi Tanjung (Pertamina UBEP), a subsidiary of Pert