A driver apparently lost control of a speeding van, which hit a curb, went airborne, struck a coconut tree and plunged into the Ala Wai Canal early Wednesday morning.

The 29-year-old Waimanalo man was able to get out of the van on his own. Police said the van had been reported stolen.

Police arrested the driver at the scene near Kalakaua Avenue about 4:15 a.m. for investigation of driving under the influence of an intoxicant, driving without a license and auto theft. Paramedics took him to the hospital in serious condition.

Waikiki resident Tim DeVault said he heard the crash from the Hawaiian Monarch at Niu Street and Ala Wai Boulevard.

"The sound was an apocalyptic spinout, then there was a huge bang," he said by phone.

He left his apartment to investigate and saw the man already out of the canal and a rescue diver trying to locate the van submerged in the murky water.

DeVault said he heard the man tell an emergency responder that he didn’t know what happened.

Tow trucks were called to the scene at about 5 a.m., but could not remove the van, which was completely underwater.

Tow truck operators said removing the van could be expensive and would require the use of divers.

A spokesman from the mayor’s office said police contacted All Island Towing to do the job.