With the modern replacement for the old Huntcliff School now open pupils decided to mark the occasion by burying the capsule to commemorate the now demolished school's past.
They collected a host of items suitable for placing into a sealed metal box which they hope people might find interesting when the box is dug up.
Whoever opens it in 2109 should discover a brief snapshot of school life in Saltburn from 2009.
In addition to hundreds of photos, stamps, pencils, CDs, key rings, a Y11 group photo and money, scores of pupils filled in small index cards with their thoughts and feelings of life at the birth of the new school.
History teacher and project coordinator, Hannah Mohon, commented: "It's social history reflecting our students thoughts and how they feel about society and the world. A historian is like a detective and part of the fun of this has been compiling something that will be fun to unpack."
Local historians Cath and Tony Lynn helped to advise on what to include in the box.
Tony said: "When the old British School was built in the 1860s they buried some sort of time capsule, but when the school was bombed in World War Two they took the rubble away and the capsule has never been found. I think this story helped fire the schools imagination to create their own time capsule."
According to time capsule historian William Jarvis, most intentional time capsules usually do not provide much useful historical information: they are typically filled with "useless junk", new and pristine in condition, that tells little about the people of the time. Many buried time capsules are lost, as interest in them fades and the exact location is forgotten, or are destroyed within a few years by groundwater. Let's hope that this capsule endures the test of time and is more successful than it's earlier counterpart.