A Danube-class runabout assigned to Deep Space 9, damaged in an asteroid field in 2372 in the accident that led to Keiko O'Brien's unborn child being transferred to Kira Nerys.
The USS Volga is the runabout involved in the Deep Space Nine episode Body Parts. Kira, Doctor Bashir and the pregnant Keiko O'Brien take it into the Gamma Quadrant for a botanical survey, and on the way back it is caught in an accident while passing through an asteroid field.
Keiko is badly injured, and Bashir can save the baby only by transferring it to Kira. Because of differences between human and Bajoran pregnancy the child cannot safely be moved back, so Kira carries the O'Briens' son to term.
The storyline was written to accommodate the real pregnancy of the actress Nana Visitor. The accident itself is not shown; the Volga is seen only as it returns to the station, and it is one of several runabouts named after Earth rivers.