Receiver Saubert executed the game-winning two-point play for Seattle.
Seattle engineered a remarkable fightback to defeat the Los Angeles Rams in overtime, clinching their spot in the postseason.
Overcoming a 30-14 deficit in the fourth quarter, the Seahawks emerged victorious by a single point at home, notching their fifth consecutive victory.
While the Rams had become the first to earn a post-season berth earlier on Sunday, the Seattle team secured their place to the play-offs after a 24-month hiatus.
With this outcome, the Seattle now lead their Conference race with a 12-3 record, supplanting the Rams, who dropped to the fifth playoff position with an eleven and four standing.
Quarterback Darnold had two picks but recovered to make two scoring throws, culminating in the second score to wideout Jaxon Smith-Njigba in overtime.
The Rams held a 13-7 lead at half-time before Walker burst through for a 55-yard scoring dash for Seattle.
Los Angeles defensive back Wallace then returned Darnold's first interception for a big return, leading to a short touchdown by Blake Corum on the next play.
In the fourth quarter, a scoring pass from Matthew Stafford to Puka Nacua pushed the Rams' lead to 30-14, but Shaheed provided the hope with a 58-yard punt return.
Darnold then found Barner in the endzone, and a converted conversion forced the game into overtime.
Although Nacua scored for his another TD in overtime, Smith-Njigba responded in kind to setup the decisive conversion.
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