UNDERWATER SHOTS; LAS of bright sun at floe edge (1:02). TRAVELLING SHOTS of algae growing in pores underneath ice (6:46). TRAVELLING MS along floe edge (0:42). TRAVELLING CS of under ice at floe edge near break up point (1:00). TRAVELLING MS along floe edge (6:20). TRAVELLING SHOTS of algae growing in pores underneath floe edge (6:00).