The word nadaba is the imperfect form of nadar in the first person singular. There are other translations for this conjugation.
See the full nadar conjugation

nadar

Él encontró a su amigo mientras nadaba en el mar.
He met his friend while bathing in the sea.
Era así cuando yo nadaba en el pueblo.
It was like this when I swam in the village.
Eva vino a despedirse del abuelo y se ahogó mientras nadaba.
Eva came to say goodbye to grandpa and drowned while swimming.
Me dio un calambre en la pierna mientras nadaba.
I got a cramp in my leg while swimming.
Creemos que pudo tener un ataque mientras nadaba.
We think he may have had an attack while swimming.
El único en el mundo que no nadaba.
The only one in the world that couldn't swim.
Vi a la chica que nadaba en el río.
I saw the girl swimming in the river.
En Bouzolles, no nadaba en absoluto, no hay agua mineral.
In Bouzolles, I didn't swim at all, there's just mineral water.
Una joven enmascarada nadaba en el agua.
A masked young girl was swimming in the water.
La última vez que estuvimos en Turquía ni siquiera nadaba conmigo.
The last time we were in Turkey, he wouldn't even swim with me.
Tuvo una epifanía mientras nadaba en el lago morado.
He had this epiphany while he was swimming at the purple lake.
Ella perdió la llave de su locker mientras nadaba en la alberca.
While swimming in the pool, she lost her locker key.
Él jugaba y trabajaba y nadaba al igual que los otros chicos.
He played and worked and went swimming just like the other boys.
¿Cómo sabía que bailaba y nadaba?
How do you know she danced and swam?
Tuve un calambre en la pierna cuando nadaba.
I had a leg cramp when swimming.
Él nadaba hasta no poder nadar más.
He swam until he could swim no more.
El pez nadaba en el agua.
The fish was swimming in the water.
¿Vio a alguien más mientras nadaba?
Did you see anyone else while you were swimming?
Cuántas veces a la semana, nadaba usted...
How many times a week did you, uh, swim...
Le dio un calambre mientras nadaba.
He got a cramp while he was swimming.
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