In a TV first for the BBC medical drama, the entire episode was filmed in one shot using just one camera.
However, some people tuning in to watch the episode were not too keen on the camerawork which left them queasy.
Many took to social media to hit out at Casualty for making them rather seasick as one person complained: “Please don't do that again as I really do feel really sick! #CasualtyOne.”
As a second wrote on Twitter: “@Jeremy_Hunt do you feel as motion sick as the rest of us after watching #casualtyone that's how your #nhs staff feel after every shift…”
A third posted: “#casualtyone made me feel a bit motion sick, but amazingly filmed in one shot…”
“Credit to cast/crew for making this one-shot episode, it's not an easy thing to do. But the camerawork is making me feel sick. #CasualtyOne,” a fourth diplomatically said.
Casualty aired a special one-shot episode this evening
Casualty was shot in one take with one camera
Despite the disquiet from some corners, the landmark instalment was praised by many more people as they hailed the unique one-shot episode and story.
“As good as #CasualtyOne was tonight, I'm gutted there was no carry on from last week's episode 'cos that was AMAZING #Casualty @BBCCasualty,” commented one fan.
Another showered the programme on praise, saying: “Excellent episode. Realistically creating the often frenetic and stressful situations in an ED. Brilliantly filmed! #casualty #oneshot.”
Someone else tweeted: “#Casualty #BBC Showed the reality of casualty depts, staff over-stretched & from all accounts underpaid. They're worth their weight in gold!”
Charlie Fairhead in the Casualty series 31 finale
Casualty 30th anniversary: Hollywood stars before they were famous
Fri, August 26, 2016
As Casualty celebrates it's 30th anniversary, we take a look at the Hollywood stars who found fame on the hit BBC medical drama.
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Hollywood heartthrob Tom Hiddleston is almost unrecognisable in his Casualty days
Nurse Duffy in the Casualty series 31 finale
This evening’s episode rounds off season 31 of Casualty in its 30th anniversary year.
The episode entitled simply One saw the stresses and strains the Emergency Department at Holby City Hospital, kicking off with an explosion in house and the death of a baby.
A large part of the finale was told through the eyes of work experience school girls Diamond Whittaker (played by Georgia Sandle) and Chloe Robinson (Kassius Nelson) as they shadowed Nurse Duffy (Catherine Shipton) during a shift.
Casualty will return to BBC One for series 32.