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.
Unfortunately the movie This Is the Sea is not yet available on HBO Max.
| Directing | Mary McGuckian | Director |
| Production | Brian Gilbert | Executive Producer |
| Production | Peter Samuelson | Executive Producer |
| Production | Judy Counihan | Co-Producer |
| Production | Marc Samuelson | Executive Producer |
| Production | Elvira Bolz | Producer |
| Production | Michael Garland | Producer |
| Sound | Mike Scott | Original Music Composer |
| Writing | Mary McGuckian | Screenplay |
| Production | Mary McGuckian | Producer |
| Production | Paul Frift | Line Producer |
| Sound | Brian Kennedy | Original Music Composer |
| Production | Ron Stoneman | Executive Producer |
| Production | Cameron McCracken | Executive Producer |
| Camera | Des Whelan | Director of Photography |
| Art | Claire Kenny | Production Design |
| Costume & Make-Up | Linda Mooney | Makeup Supervisor |
| Production | John Hubbard | Casting |
| Editing | Kant Pan | Editor |
| Costume & Make-Up | John Rocha | Costume Design |
| Production | Ros Hubbard | Casting |
| Costume & Make-Up | Odette Rocha | Costume Design |
| Editing | Alan Duffy | Editor |
| Costume & Make-Up | Carole Dunne | Hairstylist |
| Costume & Make-Up | Linda Mooney | Hair Supervisor |
| Art | David Butterworth | Art Direction |
