Roviezal Robin, 20, a local Sarawakian tour guide, is still missing.
The tourist and the local guide were swept away in the Mulu cave river in northern Sarawak at about 6pm on Friday (July 12) due to a sudden flash flood.
Eight other tourists are said to have escaped the floods that happened in Deer Cave.
Initial information said Hoverkamp was from Germany.
Miri Fire and Rescue Department chief Supt Law Poh Kiong said Hoverkamp was found drowned.
"The tourist is from Holland. His body was found at 6.40am inside the cave.
"The search for Robin is ongoing.
The search team headed by Supt Law is made up of 16 members, including Sarawak Bomba's Storm (special search-and-rescue unit) unit.
The police notified Bomba on the incident at 6pm Friday.
Bomba Miri also deployed a helicopter to the scene on Saturday morning.
Mulu is about 200km inland from Miri city.
>This story has been amended to correct some information.