The word nadaban is the imperfect form of nadar in the third person plural.
See the full nadar conjugation

nadar

Volavan por el aire y nadaban en los mares.
Flew through the air and swam in the seas.
Yo estaba en la tienda y ellos nadaban.
I was in the tent and they were in swimming.
Paul te conozco nadaban mientras hacía este programa.
Hey Paul I know you were swimming while doing this program.
Conversamos, leímos el libro y comimos, mientras los niños nadaban en la piscina.
We chatted, read the book, and ate, while the children swam in the pool.
Personalmente, no me interesaba como nadaban.
Well, I wasn't so interested in the swimming.
La última vez que te vi, Lex y tú eran niños y nadaban en el lago.
The last time i saw you, you and lex were both children.
No se dio cuenta al principio, nadaban en la parte trasera del barco de motor.
He at first did not notice, that they zuschwamm on the stern of the motorboat.
Varios otros niños se unieron al grupo cuando decidimos examinar a los peces que nadaban en nuestro acuario.
Several other children joined the group when we decided to examine the fish swimming in our aquarium.
Vimos criaturas, estas cosas, que nadaban en el aire y lo llenaban, todo el tiempo.
We saw creatures, these... things that were swimming around in the air and fill it all the time.
Ellos nadaban.
They were swimming.
Los grandes cisnes nadaban alrededor del recién llegado, y le acariciaban el cuello con sus picos como una bienvenida.
The great swans swam round the new-comer, and stroked his neck with their beaks, as a welcome.
De las 80 personas que nadaban ese día, 65 oscilaban entre las edades de 9 y 13.
And of the 80 people swimming that day, 65 of them were between the ages of nine and 13.
El primer ejemplo está compuesto por los lenguados jóvenes que antes del cierre nadaban en el Grevelingen.
The first example is about the young plaice that lived in the Grevelingen before the closure of the dam.
Las muchas preguntas que nadaban por la parte delantera de su mente fueron empujadas hacia atrás para ser pensados en otro momento.
The many questions that swam to the forefront of his mind were pushed to the back to be addressed later.
Al día siguiente, 20 de junio, a la 1:30 p.m., barcos patrulleros cubanos fueron vistos de nuevo lanzando granadas a cubanos que nadaban hacia la base.
On the following day, June 20, at 1:30 p.m., Cuban patrol boats were seen once again lobbing grenades at Cubans swimming towards the base.
¿Recuerdan que tenían esos personajes que se reducían hasta niveles microscópicos, se metían por dentro, y nadaban y volaban por todas estas estructuras biológicas?
And you remember, they had these characters that they would shrink down to these microscopic levels, and then they would sort of swirl in and swim around and fly around all these biological structures?
El 19 de junio de 1994, a las 2:00 p.m., oficiales de la Base Naval de EU vieron a un grupo de cubanos que nadaban hacia la base, seguidos por un barco patrullero cubano.
On June 19, 1994 at 2 p.m., officers of the U. S. Naval Base espied a group of Cubans swimming toward their territory, followed by a Cuban patrol boat.
Con unos pocos kilómetros de recorrido llenamos nuestros pulmones de aire puro y nuestros ojos de hermosos colores verdes. Después, en un lago de aguas muy frías, intentamos pescar los salmones que nadaban frente a nosotros.
We just had to travel along a few kilometers to fill our lungs with fresh air and our eyes with delightful shades of green. Afterwards, in a lake with very cold waters, we tried to fish the salmon swimming in front of our eyes.
Los patitos recién nacidos nadaban en el lago.
The newborn ducklings were swimming on the lake.
El salvavidas bordeaba la piscina mientras vigilaba a los niños que nadaban.
The lifeguard skirted the swimming pool while he watched the kids swimming.
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