Tight end Saubert executed the game-winning two-point conversion for Seattle.
Seattle engineered a remarkable comeback to overcome the Rams in extra time, securing their spot in the postseason.
Overcoming a 30-14 deficit in the fourth quarter, the Seattle squad triumphed 38-37 at home, notching their fifth straight win.
While the Rams had become the first to earn a playoff berth earlier on game day, the Seattle team secured their place to the play-offs after a 24-month hiatus.
With this outcome, the Seahawks now lead their division's race with a twelve and three mark, replacing the Rams, who fell to the number five seed with an eleven and four record.
Signal-caller Sam Darnold had two interceptions but recovered to make two scoring throws, culminating in the tying score to wideout Smith-Njigba in the extra period.
The visitors held a six-point lead at half-time before Walker burst through for a long touchdown run for Seattle.
Los Angeles defensive back Josh Wallace then returned Darnold's initial pick for a big return, setting up a one-yard score by Blake Corum on the next play.
In the final stanza, a touchdown from Matthew Stafford to Nacua extended the Rams' lead to 30-14, but Shaheed ignited Seattle's comeback with a 58-yard punt return.
Darnold then found AJ Barner in the endzone, and a converted two-point play forced the contest into an extra period.
Although Nacua raced in for his another touchdown in OT, Jaxon Smith-Njigba answered in kind to setup the decisive score.
Elara Vance is a digital strategist with over a decade of experience in tech consulting, specializing in helping UK businesses navigate digital transformation and IT innovation.