Incredible photos show a side of synchronized swimming you've never seen before

In synchronized swimming, most of the action happens above the water. Spectators never get a chance to see what's going on beneath all the graceful lifts and kicks on the surface - until now.

A series of underwater photos snapped during the synchronized swimming duet finals at the Rio Olympics gives an intimate glimpse at the unseen parts of swimmers' routines.

Here's what it really looks like inside the Olympic synchronized swimming pool: