Details of 47-year-old Antony Paul Hanney's brazen entry into the hospital and subsequent disguise were revealed during sentencing submissions in Wagga District Court this week.

Hanney has pleaded guilty to sexual intercourse without consent and to indecent assault.

His victims, aged 77 and 86, were attacked between 9pm and 9.30pm on September 30, 2012, as they lay in their beds in separate areas of the private hospital.

Hanney's movements in the hospital - including walking into a room and then coming out of it dressed in surgical clothing - were captured by security cameras.

The footage was vital in identifying Hanney as the offender.

Calvary Health Care Riverina chief executive, Jo Williams, yesterday confirmed Hanney had been employed at Calvary Hospital as a cleaner and left the job about three-and-a-half years before the attacks.

The night Hanney struck, he came in behind a genuine visitor, lying to him that he was there to see someone who worked in the hospital.

Once inside the hospital, Hanney went into a room to slip on the scrubs then boldly strode into the separate rooms where his vulnerable victims lay.

Mrs Williams yesterday repeated comments she made after the attack about how upset she and Calvary Health Care Riverina felt over the incident.

"As an organisation, we are devastated," Mrs Williams said.

"We are a mission-based organisation and we have a commitment to the principle of patients should not experience harm in our hospitals.

"We are here to care and look after them."

Mrs Williams said Calvary had made close contact with the victims and their families after the incident and had offered apologies as well as ongoing support and counselling.

"I personally have apologised to both the victims and their families," Mrs Williams said.

She said security at Calvary Hospital - which before the attacks included restricted after-hours access and security cameras that helped catch Hanney - had been bolstered.

A security review was conducted with the help of a consultant and improvements were made both immediately and ongoing.

Hanney will be sentenced in the District Court at a time to be decided, but possibly as early as next week.

His crime horrified even experienced law officials.

"It is unspeakably tragic these two women were subjected to such vile conduct at their age and stage of life," said Crown representative, Virginia Morgan, in her sentencing submission.

Ms Morgan said Hanney had employed a certain degree of cunning and planning in his crimes.

"He knew the layout, he knew the workings of the hospital," Ms Morgan said.