Royal Caribbean cruise ship Voyager of the Seas on board this week. The two holidaymakers – one 75-years-old and the other 61-years-old – had embarked on a four-day cruise from Singapore on Monday. Both were from Singapore and believed to have died during a short trip. Royal Caribbean have extended their condolences to families of the two passengers.

It is not known on the precise days the two travelers died but are said to be unrelated.

A Royal Caribbean spokeswoman told "We extend our most sincere condolences to the families of the 75-year-old and 61-year-old guests from Singapore who died of unrelated natural causes while onboard Voyager of the Seas ,

During this difficult time. "

Voyager of the Seas is scheduled for a four-day cruise to Penang, Malaysia.

It arrived at the Malaysian destination on Tuesday before setting off and docking at Phuket, Thailand yesterday (15 May).

The cruise ship is expected to return to Singapore on Friday 17 May.

According to local Singaporean news site The Straits Times, tickets for the trip cost from US $ 491 (£ 384).

On a ship, the announcement "Operation Bright Star" is made, which alerts the crew to the death of a passenger.

The body is then zipped up in a body bag and put in the ship's morgue. There is usually space for three or four bodies on board.

Tina Molson, 52, from Cleethorpes, who worked on an onboard duty-free store from 2002 to 2010, has explained that deaths are not that rare.

"Many of the older passengers go for months because it's cheaper than living at home. Some even go to sea to the. There's a dead on board. "Tina told The Sun.

There are an estimated 200 passenger deaths a year onboard cruise ships, according to The Telegraph.

Most cruise ship deaths are a result of age-related illnesses – the average age of a British passenger was 56 in both 2017 and 2016, according to industry figures.

Last month, on the SuperStar Aquarius, operated by Hong Kong-based Star Cruises, which is stored in a freezer for the remainder of the cruise.

None of the passengers on board were allegedly aware of the death.

A statement from Star Cruises said the company had "immediately informed Taiwan's Coast Guard's Administration of the incident and the passenger's family."

However, Chih-huang's family say they only learned the death through the coastguard.