A recovery mission under way after the star disappeared on a boat outing with her 4-year-old son on a lake in California. Kaylee Hartung is there at that lake with new details on this, good morning, Kaylee. Reporter: Good morning, Cecilia. We're now heading into day three of the search for naya Rivera here at lake piru. At this time yesterday authorities were hopeful but now they are being realistic saying they presume she drowned this. Is now a recovery mission. This morning the desperate search for missing singer and actor naya Rivera is now a recovery mission after finding her 4-year-old son sleeping on a boat buy himself. The emergency is we have a missing person. Mom nowhere to be found. Reporter: They do not expect foul play. Our hearts and our thoughts go out to the Rivera family. Reporter: She was last seen alive leaving the dock for a fun afternoon on this pontoon boat. The search began Wednesday when the employee that rented her the boat did not return. It can't be easy when your witness is a 4-year-old. No, because you want to try to limit the amount of trauma he's going through. What he may understand and what he may not understand until later, so we try to be mindful of that. Reporter: The search involving 100 personnel. Dive teams in the water, drones and helicopters in the sky. Not being able to locate her body. Authorities say lake piru presents challenges, low visibility and uneven terrain, up to 50 feet deep in some areas. Change.org petition calling for warning signs to be placed at the lake. I don't know why I like it Reporter: She's famous for her role as santana Lopez on "Glee" known for her searing insults. Stick a sock in it. Reporter: Becoming a fan favorite as the character evolved over six seasons showcasing vulnerable. lay me down on a bed of roses Reporter: And coming out as Gaye. I love girls the way I'm supposed to feel about boys. Reporter: Heather Morse releasing this statement to ABC news, it's so hard to wrap your head around something unknown holding on hope that the rescuers will bring naya home. Her co-stars sharing their shock and sadness at her disappearance. Gloria estefan writing this note on Twitter praying for a miracle for naya Rivera and her family, particularly her baby boy. Authorities remain here at the lake overnight in that search resuming at daybreak. As her family waits for answers we know her 4-year-old son has been reunited with her ex-husband Ryan Dorsey. Thank you so much.