[Ol' Dan Tucker]

Since there doesn’t appear to be scrubbers in that can, how do they filter out toxic gases?

There are scrubbers on Titan.

From one of their video pages: OceanGate Scrubber Overview:

One of the many essential life support systems on a dive is a CO2 (carbon dioxide) scrubber. Our scrubbing system for Cyclops 1 and Titan contains soda lime. Soda lime are white granules that contain a mixture of calcium hydroxide (~75%) and sodium hydroxide (3%) with a precise amount of water moisture and binding agents. They absorb CO2 from the air via an exothermic, water facilitated, base catalyzed chemical reaction. The fans in our subs circulate air throughout the interior so all breathing air is consistently brought to the scrubber unit and cleaned of CO2.

[mikey_hates_everything]

“There are scrubbers…”

Ok, so they got that going for them…

[desertsolitaire]

I believe those scrubbers only function as long as there is power to them and the circulating fans.. no power no scrubbing from there on. I suppose the claimed 96 hours of oxygen depends upon the scrubbers fully functioning the entire time.