A large presence from the Federal Bureau of Investigations (FBI) is now visible at the Santa Barbara Harbor.
The agency's evidence response team and underwater search and evidence recovery team are assisting the lead agency's handling the deadly Conception boat fire investigation.
Several tents and vehicles were set up in the parking lot by Wednesday morning with many agents nearby.
The Santa Barbara County Sheriff's Office says sonar mapping technology is being used to map the ocean floor in specific areas in an effort to find the final victim.
Thirty-three bodies have been located so far.
The FBI's dive team is among those assisting the Santa Barbara County Sheriff's Office Underwater Search and Recovery team with the large-scale operation underway in the waters near the north end of Santa Cruz Island.