"Deep Ones Bring Gifts" missions

[Marrik]

Is this supposed to be an undercover mission? For some reason we are able to use a Hummvee for it, but we can only use the surf mission gear. This seems like kind of a contradiction.

Also on an unrelated note, when you reload the sawed-off shotguns it makes a pumping sound, even though it's a double-barreled sawed-off. It would make more sense if it had the same sound as the double barrel.

[Solarius Scorch]

Is this supposed to be an undercover mission? For some reason we are able to use a Hummvee for it, but we can only use the surf mission gear. This seems like kind of a contradiction.

The Humvee can be used in all beach missions.
At this point I am not sure why, since it indeed feels counter-intuitive. But you can also take it to the Surftime mission.

Also on an unrelated note, when you reload the sawed-off shotguns it makes a pumping sound, even though it's a double-barreled sawed-off. It would make more sense if it had the same sound as the double barrel.

OK, no problem, done.