Authorities working on the investigation in Fall River, about 50 miles south of Boston, expected to need most of the weekend to pump nearly a quarter-million gallons of water from the pool into nearby sewers.
The Vietnam Veterans Memorial Pool at Lafayette Park was closed after 36-year-old Marie Joseph's body surfaced June 28, perhaps two days after she drowned.
Authorities have said the cloudy water hid her body in the pool's murky deep end. The death of the Newport, R.I., hotel housekeeper from Haiti has been ruled an accident.
The state Department of Conservation and Recreation is investigating.
