JENKS --- Tonight is the first night of the Oklahoma Aquarium's annual HallowMarine.
The five-night event is open to all ages and allows trick-or-treating in a safe, indoor environment.
"HallowMarine is spooky, but not too spooky," Teri Bowers with the Oklahoma Aquarium said. "It's really geared toward the little ones. So it's a great family time."
Activities and entertainment include mermaid and pirate divers, a bounce house and slide, a peewee pirate zone for kids 5 and under, a carnival, and trick-or-treat candy trail.
Bowers said all of the aquarium exhibits remain open during HallowMarine.
Admission is $7 for children ages 3 to 12, and $10 for ages 13 and older. Children 2 and under get in free.
HallowMarine is Oct. 27-31 from 6:30 to 9 p.m. each night.
The Oklahoma Aquarium is located 300 Aquarium Dr. in Jenks.