Tight end Saubert executed the decisive two-point conversion for the Seahawks.
The Seattle Seahawks engineered a remarkable fightback to defeat the Rams in extra time, clinching their place in the postseason.
Rallying from a sixteen-point deficit in the fourth quarter, the Seahawks emerged victorious 38-37 at home, notching their fifth straight win.
While the Los Angeles had become the first to earn a post-season berth earlier on game day, the Seattle team secured their place to the postseason after a 24-month absence.
With this outcome, the Seahawks now lead their division's race with a twelve and three mark, replacing the Los Angeles, who fell to the number five playoff position with an eleven and four record.
Signal-caller Darnold had two picks but regrouped to make two scoring throws, including the second TD to star receiver Jaxon Smith-Njigba in the extra period.
The visitors held a six-point lead at the break before Kenneth Walker III broke free for a 55-yard scoring dash for Seattle.
Rams cornerback Josh Wallace then returned Darnold's initial interception for a big return, setting up a one-yard score by Corum on the ensuing snap.
In the final stanza, a touchdown from Stafford to Nacua pushed the advantage to 30-14, but Rashid Shaheed ignited Seattle's hope with a spectacular return for a score.
Darnold then found AJ Barner in the end zone, and a converted conversion sent the contest into an extra period.
Although Nacua scored for his second TD in overtime, Smith-Njigba responded in kind to set up the game-winning score.