Learn German: Er soll das Gold tief im Dschungel vergraben haben. - He is said to have buried the gold deep in the jungle.

To say "should have buried," you would use the subjunctive form (Konjunktiv II): Er hätte das Gold vergraben sollen. Here, using the present tense soll with the past infinitive (vergraben haben) signals subjective hearsay. It means the rumor exists right now (soll), but the action happened in the past (vergraben haben).

Why does haben come at the very end of the sentence?

The modal verb soll is the conjugated verb in the second position, which pushes the rest of the verb phrase to the end. The phrase vergraben haben is a "Perfekt Infinitive" (past infinitive), formed by the past participle (vergraben) followed by the infinitive of the helping verb (haben).

Wait, isn't vergraben the infinitive form? Where is the past participle here?

vergraben is actually the past participle in this sentence, but it happens to look exactly like the infinitive! Because the verb starts with the inseparable prefix ver-, it doesn't get the usual ge- added to it in the past participle.

Why do we use the dative im (in dem) for Dschungel? Doesn't burying something involve movement?