"I feel incredibly blessed to have had you in my life," she told her family and friends.
He had received "a few WhatsApp messages" from people who saw the post, he said.
SCDF reminded the public to avoid leaving batteries or devices charging unattended for an extended period of time, or overnight.
The ship was set to sail on 7 May but remained in port overnight due to the technical issues.
Another 15-year-old student was critically injured and admitted to the Intensive Care Unit (ICU) at Sibu Hospital.
"Sometimes, the longer road builds more resilience, clarity, and confidence," Mr Rizal wrote.
The other underage rider sustained minor injuries in the collision.
While track works are due to be complete on 18 Oct, the expanded depot is due for completion in 2027.
Rescue efforts are underway to evacuate those trapped on the volcano.
He was unconscious when taken to Woodlands Hospital, where he later died.