The film is set in Northern Ireland shortly after 1994 cease-fire. Hazel is a Protestant and Malachy a Catholic. Romance between them is threatened by Rohan (leader in militant underground and pal of Malachy's brother Padhar), who wants Malachy to be recruited and fight for the cause and by Hazel's brother Jef, who spies on her meetings.
You can now watch This Is the Sea online on the following streaming providers in the United States.
| Directing | Mary McGuckian | Director |
| Writing | Mary McGuckian | Screenplay |
| Production | Elvira Bolz | Producer |
| Production | Judy Counihan | Co-Producer |
| Production | Paul Frift | Line Producer |
| Production | Michael Garland | Producer |
| Production | Brian Gilbert | Executive Producer |
| Production | Cameron McCracken | Executive Producer |
| Production | Mary McGuckian | Producer |
| Production | Marc Samuelson | Executive Producer |
| Production | Peter Samuelson | Executive Producer |
| Production | Ron Stoneman | Executive Producer |
| Sound | Brian Kennedy | Original Music Composer |
| Sound | Mike Scott | Original Music Composer |
| Camera | Des Whelan | Director of Photography |
| Editing | Alan Duffy | Editor |
| Editing | Kant Pan | Editor |
| Production | John Hubbard | Casting |
| Production | Ros Hubbard | Casting |
| Art | Claire Kenny | Production Design |
| Art | David Butterworth | Art Direction |
| Costume & Make-Up | John Rocha | Costume Design |
| Costume & Make-Up | Odette Rocha | Costume Design |
| Costume & Make-Up | Carole Dunne | Hairstylist |
| Costume & Make-Up | Linda Mooney | Makeup Supervisor |
| Costume & Make-Up | Linda Mooney | Hair Supervisor |
