On flight day five, after evaluating air quality inside Dragon, the crew opened the hatch between Dragon and the station at 05:53 EDT (09:53 UTC).
Pettit and Russian cosmonaut and station commander Oleg Kononenko were the first crew members to enter the Dragon.
They wore protective goggles and breathing masks as they performed further tests to make sure the atmosphere inside the capsule was safe, which it was, though Pettit noted that "the inside smells like a brand new car."

Dragon spent approximately six days berthed to the space station, allowing astronauts time to unload its cargo.
They then reloaded it with Earth-bound cargo.
On 27 May, while being controlled by Mission Control Houston, Dextre was used to survey Dragon's trunk.

On its final day at the station, 31 May, the crew unberthed Dragon from Harmony using the Canadarm2 at 05:49 EDT (09:49 UTC).
The arm moved Dragon about 10 m (33 ft) away from the station and released it.
Dragon then performed a series of engine burns that placed it on a trajectory to take it away from the vicinity of the station.
Mission Control Houston then confirmed that Dragon was on a safe path away from the complex.
SpaceX instructed Dragon to close its bay door and approximately four hours after Dragon left the station, it began to conduct its nine-minute-long deorbit burn.
The Dragon capsule jettisoned its trunk and began to re-enter the Earth's atmosphere.
Its heatshield protected it during most of the re-entry and when low enough in altitude its two drogue parachutes were deployed, followed by its three main parachutes.
The Dragon capsule splashed down into the Pacific Ocean about 900 km (560 mi) from the Baja Peninsula at approximately 11:42 EDT (15:42 UTC) and was recovered by a small fleet of recovery vessels from the contractor hired by SpaceX, American Marine.
On flight day five, after evaluating air quality inside Dragon, the crew opened the hatch between Dragon and the station at 05:53 EDT (09:53 UTC). Pettit and Russian cosmonaut and station commander Oleg Kononenko were the first crew members to enter the Dragon. They wore protective goggles and breathing masks as they performed further tests to make sure the atmosphere inside the capsule was safe, which it was, though Pettit noted that "the inside smells like a brand new car."
Dragon spent approximately six days berthed to the space station, allowing astronauts time to unload its cargo. They then reloaded it with Earth-bound cargo. On 27 May, while being controlled by Mission Control Houston, Dextre was used to survey Dragon's trunk.
On its final day at the station, 31 May, the crew unberthed Dragon from Harmony using the Canadarm2 at 05:49 EDT (09:49 UTC). The arm moved Dragon about 10 m (33 ft) away from the station and released it. Dragon then performed a series of engine burns that placed it on a trajectory to take it away from the vicinity of the station. Mission Control Houston then confirmed that Dragon was on a safe path away from the complex. SpaceX instructed Dragon to close its bay door and approximately four hours after Dragon left the station, it began to conduct its nine-minute-long deorbit burn. The Dragon capsule jettisoned its trunk and began to re-enter the Earth's atmosphere. Its heatshield protected it during most of the re-entry and when low enough in altitude its two drogue parachutes were deployed, followed by its three main parachutes. The Dragon capsule splashed down into the Pacific Ocean about 900 km (560 mi) from the Baja Peninsula at approximately 11:42 EDT (15:42 UTC) and was recovered by a small fleet of recovery vessels from the contractor hired by SpaceX, American Marine.
SpaceX COTS Demo Flight 2