For the first five years of a green sea turtle's life, very little is known.
After the hatchlings make their way into the ocean, biologists aren't clear about what happens next.
But a new study is working to answer the big question.
"They hatch out of their eggs. They go into the ocean, and we don't see them for a while," biologist Malini Parker said.
Biologists said it's a mystery. After herds of baby green sea turtles leave the beach, it's unclear where they go.
"You won't see them until they are either sick or it's time to nest," Parker said.
But a National Oceanic and Atmospheric Administration research project at the Waikiki Aquarium is working to solve the mystery.
Scientists said they'll attach a device to each of the turtles, so they can track them when they are released.
"When the turtles are released, they will be satellited, and that way, we will be able to find out about where they go," Parker said.
But before they are sent off, biologists will use the time to collect data, taking the four turtles out of their exhibit each week.
"They are weighed. They are measured. Their shells are cleaned. We have a good look for any kind of ... lesions," Parker said.
Along with scales and measuring tools, biologists use raw honey. They scoop some on the back of the toothbrush, put it on some of the turtles' lesions, and it works as a natural antibacterial.
Hawaiian green sea turtles are believed to be different from other populations. One thing that sets them apart is that they come out of the water to bask on the beach.
"Other turtles don't do this. Other turtles go up when it's time to nest or when something is wrong, but for the most part, they spend their entire lives out of the ocean," Parker said.
As for these four turtles, time in the ocean is all that biologists need to find out where they go.
"I am very sure they are going to be fine, and in five years, they will be basking in the sun somewhere," Parker said.
There's no set date for when the aquarium is planning to release the turtles, but when they do, they plan to bring in a whole new group of young ones to keep the research project going.