Escape from the Aquafien

The Doctor tells his companions that he has mistaken their landing place as the TARDIS is hurtling towards the ocean. However, they are lucky as they are still able to breathe. Exiting the TARDIS, Ian speculates that they must be inside an air pocket while a creature comes up from behind Barbara and lifts her up. The Doctor instructs Ian to use his ray gun on the creature. Doing so, the Aquafein releases his grip on her. However, more Aquafeins turn up, to which the Doctor states that they should move on to another age.