English to Spanish Tech/Engineering Environment & Ecology confined spaces

Confined spaces include, but are not limited to, tanks, process vessels, piping, bins, boilers, pits, sewers, ventilation and exhaust ducts, underground utility vaults, tunnels, manholes, pump lift stations and open top sumps.

podría ser esto como una zanja abierta?? estoy totalmente perdida, de antemano agradezco su ayuda